Control and Coordination Class 10 Notes CBSE Science Chapter 7 (Free PDF Download)

Animals- Nervous System: 

• The nervous system is an organ system that controls and coordinates many-body actions in animals. The brain, spinal cord, and a vast network of nerves that run throughout the body make up the nervous system.

• Sending, receiving, and processing messages in the form of chemical signals known as impulses is the responsibility of the nervous system.

• Nervous tissue is made up of a network of nerve cells or neurons that is well-organized. It is designed to transmit information from one part of the body to another via electrical impulses. The basic unit of the nervous system is the neuron.

• Each neuron is made up of three parts: the cell body, also known as the cyton, branched projections known as dendrites, and the long process leading from the cell body, known as the axon.
  
  

• A synapse is a connection between two neurons.

• Nerves are strands of tissue that emerge from the brain and spinal cord. Nerves are crucial for conveying messages throughout the body and branch out to all regions of the body.

• Nerve cells or neurons come in a variety of shapes and sizes.

• The brain or spinal cord receives messages from the sense organs via sensory nerves.

• Motor neurons transmit messages from the brain or spinal cord to all of the body's muscles and glands.

• Interneuron or relay neuron is a type of neuron that connects neurons in different parts of the central nervous system.
  
  

What Happens in Reflex Actions?

• A reflex action, often known as a reflex, is an automatic and practically immediate movement that occurs in reaction to stimuli. In response to the environment, the body produces a reflex activity.

• It is possible that the process of detecting a signal or an input and responding to it with an output action can be accomplished rapidly. A reflex arc is a term used to describe such a link. Although the information input reaches the brain, reflex arcs are created in the spinal cord. The majority of sensory neurons in higher animals do not flow directly into the brain, but rather synapse in the spinal cord. For a quick response, reflex arc continues to be more efficient.

Human Brain:

Types of the Nervous System

The central nervous system and the peripheral nervous system are the two parts of the nervous system.

Central Nervous System: 

• The brain and spinal cord are part of the central nervous system. It receives data from the body and transmits instructions to certain organs. The forebrain, midbrain, and hindbrain are the three major portions or areas of the brain.

• The forebrain is the region of the brain that is responsible for thinking. The cerebrum and diencephalon make up this structure. Memory and intelligence, as well as sense centres such as hearing, smell, and sight, are all housed in the cerebrum. The diencephalon is where pressure and discomfort are stored.

• The midbrain connects the forebrain to the hindbrain and regulates vision and hearing reflexes. The cerebellum, pons, and medulla make up the hindbrain. The cerebellum is responsible for coordinating muscle actions as well as maintaining balance and posture.

• The medulla is in charge of involuntary functions such as blood pressure, salivation, vomiting, and heart rate. The spinal cord is protected by the vertebral column or backbone and extends from the medulla of the brain through the entire length of the vertebral column.
  
  

Peripheral Nervous System: 

The cranial and spinal nerves emerge from the brain and spinal cord, respectively, to form the peripheral nervous system.

What Safeguards are in Place for the Tissues?

The brain is protected by the sturdy bones of the skull, as well as a fluid called cerebrospinal fluid, which absorbs additional shock.

What is the Mechanism by Which the Nervous System Causes Action?

Muscle fibres must move when a nerve impulse reaches them. Muscle cells will shorten as a result of their changing form. Special proteins in muscle cells change their form and arrangement in the cell in response to nerve electrical signals. When this happens, the muscle cells take on a new shape as a result of new protein groupings.

• Plant Coordination: All living organisms react to their surroundings. Chemicals released by cells help plants respond to stimuli as well. Plants, like all living beings, move about. Plants have two types of movement: one that is dependent on growth and the other that is not.

Plants also use electrical and chemical mechanisms to transmit information from cell to cell, but there is no dedicated tissue for information transmission in plants. Plants slowly respond to stimuli by growing in a specific direction. Because of the directional growth, the plant looks to be moving.

• Directional Movements: Tropic movements are also known as directional movements. These movements can be either toward or away from the stimuli.

• Shoots that respond to light by bending towards it are said to have positive phototropism. Shoots that grow away from the earth show negative geotropism.

• Negative phototropism occurs when roots bend away from light. They demonstrate positive geotropism as they grow towards the ground.

• Hydrotropism is a type of growth response in which the direction of growth is dictated by water stimuli.

• Chemotropism is a plant part's growing movement in response to a chemical input.

• Thigmotropism refers to movement of plant parts in response to touch stimulus. They demonstrate positive thigmotropism when movement is towards touch and negative thigmotropism when movement is away from touch.

• Pollen tubes grow towards the ovules.

• Hormones are chemical molecules secreted by cells that have been activated.

• Hormones circulate throughout the cell. They are synthesised far from the point of action and then diffuse to the point of action. Different plant hormones aid in the coordination of growth, development, and environmental reactions. Auxins, gibberellins, cytokinins, and abscisic acid are some of the hormones secreted by plants.

• Auxins are hormones that are produced at the stem's tip. By elongating the cells, they aid the plant's growth. Auxin promotes shoot apical dominance. Gibberellins are hormones that promote stem growth, seed germination, bolting, and blooming.

• Cytokinins are hormones that are found in regions where cells divide quickly, such as fruits and seeds. They also encourage the stomata to open.

• Abscisic acid is a hormone that slows growth in many regions of the body. It's also in charge of closing the stomata. Its side effects include leaf withering.

• Animal Hormones: The endocrine system is made up of ductless glands that emit chemical compounds known as hormones. Hormones are released directly into the bloodstream by endocrine glands.

• Hormones are chemical messengers that are injected into the bloodstream and act on specific organs.

Endocrine Glands

The pituitary gland, the pineal gland, the hypothalamus, the thyroid, the parathyroid, the thymus, the adrenal gland, the pancreas, the testes, and the ovary are all examples of endocrine glands.

Adrenal Glands: 

Adrenal glands are found above the kidneys. The adrenal cortex and adrenal medulla are two parts of the adrenal gland.

• The adrenal cortex secretes cortisol, aldosterone, and androgens, while the adrenal medulla secretes adrenaline and noradrenaline. Adrenaline is sometimes known as the "fight or flight" hormone or the "emergency hormone." It prepares the body to deal with physical stress in an emergency situation, such as danger, anger or excitement.
  
  

Thyroid Gland:

• The thyroid gland is one of the largest endocrine glands in the body, and it is positioned in the neck, ventral to the larynx. 

• Triiodothyronine and thyroxine are the main hormones generated by this gland. Thyroxine is a hormone that controls the body's glucose, protein, and fat metabolism. Iodine is required for the production of thyroxin. Goitre is caused by a lack of iodine in the diet. A swollen neck is one of the signs of this condition.
  
  

Pituitary Gland:

• The pituitary gland is a master gland that secretes several hormones to regulate the organs as well as the other glands. It is located near the base of the brain.

• Growth hormone, TSH, FSH, LH, ACTH, MSH, Vasopressin, and Oxytocin are among the hormones released by this gland. Growth hormone is a hormone that controls the body's growth and development. Dwarfism is caused by a lack of this hormone throughout childhood. Gigantism is caused by the excessive release of this hormone.

Gonads: 

Female gonads and male gonads are the two types of gonads found in humans.

Female Gonads: 

• Oestrogen and progesterone are two hormones produced by the ovaries.

• Oestrogen regulates puberty-related changes such as feminine voice, soft skin, and mammary gland development; progesterone regulates uterine changes during the menstrual cycle and aids in the maintenance of pregnancy.
  
  

Male Gonads:

• In males, a pair of testes constitutes the gonads. 

• A pair of testes is the male sex organ placed outside the abdomen in the scrotum.

• The hormone testosterone is produced by the testes.

• Testosterone regulates the changes that occur throughout puberty, such as a deeper voice, the development of the penis, and the growth of facial and body hair.
  
  

The Pancreas:

• The pancreas is found just below the stomach, within the duodenum's curvature. Its role is both exocrine and endocrine. Insulin, glucagon, somatostatin, and pancreatic polypeptide are among the hormones secreted by the pancreas. 

• Insulin is a hormone that controls the amount of sugar in our blood. Insulin secreted in little amounts raises blood sugar levels, resulting in diabetes mellitus.

The Pineal Gland:

• The pineal gland generates the hormone melatonin and is located towards the centre of the brain, dorsal to the diencephalon. 

• Melatonin has an impact on reproductive development, wake and sleep pattern modulation, and seasonal functions.

The Hypothalamus:

• The hypothalamus is a neuro-endocrine region of the brain that connects the neurological and endocrine systems via the pituitary gland, which secretes hormones like Somatostatin and Dopamine.
  
  

Parathyroid Glands:

• Two pairs of small oval-shaped glands embedded on the dorsal surface of the thyroid gland in the neck are known as parathyroid glands.

• They secrete a hormone called parathormone. It aids in calcium and phosphate ion control in the bones and blood.

• Tetany is caused by hyposecretion, while osteoporosis is caused by hypersecretion.
  
  

The Thymus Gland:

• The thymus gland is located in the upper region of the sternum, in front of the heart, and generates the hormone thymosin. It also aids in the maturation of T-lymphocytes.

• The hormone testosterone is produced by the testes.

• Feedback systems control the timing and amount of hormones released. For example, when blood sugar levels rise, the pancreatic cells sense it and respond by creating more insulin. Insulin secretion decreases when blood sugar levels fall.
  
  

The Nervous System

The nervous system works with multiple organs coming together to transfer the electric signals from the brain to the other parts of the body. The neurons present in the nervous system work as a functional and structural unit of the nervous system.

Neuron

Neurons constitute three main parts, namely dendrites, Cyton, and Axon. The work of dendrites is to receive the impulses from the other neurons. The Cyton will process the impulse which dendrites have taken. Once the Cyton processes the impulse, Axon switches the impulse to another neuron or the muscle and glands, depending on the requirement.

Lastly, the Axon is of two types, the first one is myelinated, and the other one is non-myelinated. The transfer of the impulse will be faster in the myelinated neurons.

Different Parts of the Brain and their Importance

• Cerebrum: It is responsible for reasoning, logic, emotions, speech, memory, auditory and taste stimuli, etc. if this part of the brain doesn't work correctly, the individual might not be able to hear or speak.

• Cerebellum: We know these words may sound similar to students, but they are named after different brain parts. The cerebellum is responsible for the body's movements, such as walking, running, sitting, posture, and balance. 

• Pons: This is the brain's relay network, which helps in transferring signals from the hindbrain to the forebrain parts. 

• Medulla Oblongata: This part of the brain controls all the involuntary movements which our body does. The vomit you feel, the sneeze you make, along with the yawn which you take all of it is regulated by the Medulla Oblongata. This part of the brain will also continue to the spinal cord, which follows the vertebral column and controls all the reflex actions that the human body does.
  
  

Different Types of Nervous System in Class 10 Science Chapter 7 Notes

In Class 10 Chapter 7 science notes, we learn about three different types of nervous systems, and all of them are explained in detail in this section.

Central Nervous Systems (CNS)

The notes of Chapter 7 Science Class 10 from Vednatu describe adequately how the CNS, the part of our human body, is made from the spinal cord and brain.

The CNS is protected by 3 main layers:

• The bony skull (cranium)

• The cerebrospinal fluid

• The meninges (Dura mater, Arachnoid and Pia mater)

Peripheral Nervous System

These are the nerves that are given out by the brain and the spinal cord for the human peripherals to work and coordinate with the brain. This nervous system contains 12 cranial nerves along with 31 spinal nerves.

Somatic Nervous System

The somatic nervous system can be found in some parts of the Peripheral nervous system. It is made from the nerves, which are responsible for the control of all the voluntary actions.

Autonomic Nervous System

The last nervous system in notes of control and coordination Class 10th is ANS. All the nerves responsible for the human body's involuntary actions are combined to form an autonomic nervous system. The ANS is divided into two parts, which are the sympathetic and parasympathetic nervous systems. The sympathetic part of the ANS prepares the body for the intense physical activity that the body is about to do. It is often the system responsible for the fight-or-flight decision-making.

Synapse 

Synapse is the neuronal junction, a site where the two neurons change their information through the electric impulse or a bridge between a neuron cell and the human gland or muscle. Without the presence of Synapses in the neuron and the muscles of a human body won't transfer and receive electrical impulses. As a result, the muscle movement will not take place, and it will remain in the same state forever.

Reflex Action

When a football is coming with a high speed right at you, you duck yourself and let the football pass over you. You do it without even thinking twice, well, that's what the reflex action is, and that's how it protects you from sudden accidents and injuries. According to Chapter 7 science Class 10 notes, a reflex action is a sudden action performed by the body in response to the stimuli. The path used for the electrical impulse to serve the reflex action is called a reflex arc.

On the other hand, the parasympathetic nervous system works in the complete opposite way. Thus, it makes your body feel relaxed and slows down many high functioning parts of your body.

Control and Coordination Notes Science Chapter 7 - PDF Download

Essential Topics in Control and Coordination Class 10 Notes

The Chapter 7 Control and Coordination of Class 10 Science Revision Notes comprise all the topics covered in the chapter to help students learn about the various complex control coordination methodologies. Given below, we have written down all topics which are essential from the exam point of view.

Benefits of Referring to Class 10 Science Chapter 7 Notes

• From Class 10 Science Chapter 7 Notes, students learn about how our body works and how it coordinates with the brain and gets signals from the brain. 

• When they learn about the control and coordination of the body, they can quickly solve and provide answers to the questions which can come up from this chapter in the board exam. 

• The human body is a complex form of life. If one can understand its working in detail by referring to these revision notes, the other forms of life will be much easier to learn.
  
  

Key Features of Class 10 Science Chapter 7 Revision Notes

• Prepared by our subject experts, these notes help students learn and revise all topics covered in the chapter Control and Coordination.

• These notes are available in free PDF format, which makes them easily accessible and convenient for students to study on any device available.

• Proper diagrams, examples, and definitions of all the important topics are provided in Class 10 Science Chapter 7 Revision Notes, making them a one-stop study resource for students.

• These notes are best utilised for exam preparation to quickly revise the important concepts.

• They are prepared according to the latest CBSE syllabus and exam format only.
  
  

Conclusion

The Control and Coordination Class 10th notes PDF on Vedantu can be easily downloaded, and one can access it even if the internet connection is not there. Students will get all the insights they are looking for in the chapter and some unusual did-you-know facts to make the learning fun.