NEET Important Questions for Biology: Chemical Control and Coordination
FAQs on NEET Chemical Control and Coordination Important Questions
1. What are Neurons?
Neurons are considered to be the structural and functional unit of the nervous system. The structure of neurons has three major parts, namely dendrites, cyton or soma or cell body, and the axon. The dendrites in neurons work in receiving the impulses from the other neurons. The cyton or soma or cell body in the neurons helps in processing the impulse carried by dendrites. Then the axon helps in transmitting these impulses to another neuron or the gland's sore muscles. These axons can be myelinated or unmyelinated as well. The impulse transmission is faster in the neurons that are myelinated than the non-myelinated ones.
2. What are the features of the Central Nervous System?
The CNS is an abbreviated form of the Central Nervous System. This system is made up of the brain and spinal cord. There are different parts of the CNS are:
Cerebrum: This is the part responsible for logic, reasoning, memory, speech, visual processing, taste, etc. This is also the part responsible for the recognition of audio and other stimuli.
Cerebellum: The cerebellum helps in regulating the body's movements. It is also responsible for the balance of the body and also for the posture that a human has.
Pons: These help in transferring the signals from the hindbrain to the forebrain
Medulla Oblongata: This part of the brain controls all the moments that are involuntary like sneezing, vomiting, heartbeats, blood pressure, yawning, etc.
3. Explain the autonomic nervous system.
In the Autonomic Nervous System, the following things happen:
The nerves of the PNS briefly control all the involuntary actions that happen in the body and end up informing the autonomic nervous system.
There are two parts of the Autonomic Nervous System, namely the Sympathetic and Parasympathetic nervous systems.
The sympathetic part of the Autonomic Nervous System helps in preparing the body for intense physical activities. This system is also considered to be responsible for fight or flight response.
The parasympathetic part of the Autonomic Nervous System works in the exact opposite manner and helps in relaxing the body and eventually slows down the high energy functions in the body.
4. What do you understand about reflex arc?
The Reflex Arc can be explained by the following points.
This is the path that is followed by the electrical impulse when a reflex action happens.
This impulse travels from the receptor organ to the brain or spinal cord.
The impulse is processed there and then gained information is brought back to the concerned muscle for carrying out the action.
Then the receptor organ, sensory or afferent neuron, interneuron motor or an efferent neuron, and effector organ are the main parts or components of a reflex arc.
5. What are Geotropism and Phototropism?
Both of the terms are defined below:
1. Geotropism
In this, the movement of plants is in response to the earth’s gravitational force and is also called gravitropism.
If the movement happens toward gravity, then it is called positive geotropism.
If the movement happens away from gravity, then it is called negative geotropism.
Roots always grow towards gravity and shoots or branches always grow against gravity.
2. Phototropism
When the plant moves in response to light it is called phototropism.
When the movement happens towards the light it is called positive phototropism.
When the moment happens away from the light then it is called negative phototropism.
Stems always move towards the light while roots always move away from the light.