Introduction to Body Fluids and Circulation

Human circulatory system, or the cardiovascular system (along with body fluid), is of vital importance.  Together, they serve as a medium of transportation for oxygen, nutrients, hormones and other important substances. 

In this article, we will cover the different types of body fluids and circulation in brief. As a result, you will become familiar with the function and importance of body fluids in our system. 

Continue reading below to find more about body fluids and circulation class 11!

What is Body Fluid?

Body fluids are several different types of liquids that are present inside the body. Generally, such fluids are either excreted out of the system or circulate within the body. 

In a broad sense, body fluids are classified as two intracellular fluid and extracellular fluid. In general, there are 7 body fluids, namely – blood, gastric juice, cerebrospinal fluid, saliva, semen, mucus and urine.  

On that note, let’s proceed to find out about the essential body fluids.

Types of Body Fluids

Undoubtedly blood and lymph are the most crucial body fluids. Human blood is a connective tissue fluid which comprises of white blood cells, red blood cells, plasma and platelets. 

Blood is red because of the presence of haemoglobin. Blood flows in two directions – from the heart to tissue and from tissues to heart. 

On the other hand, lymph is a transparent fluid which circulates inside lymphatic vessels and is also known as the tissue fluid and interstitial fluid. 

This image shows components of blood and lymph.

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Fig: Components of blood and lymph

Test Your Knowledge: Which of these is also known as RBC?

a) Leucocytes 

b) Erythrocytes 

c) Thrombocytes

Functions of Body Fluids

These are among a few functions of body fluids.

  1. Transportation of vital nutrients and oxygen to all essential organs.

  2. Removal of toxic waste.

  3. Regulation of body temperature.

  4. Regulation of metabolism.

DIY: Find out the largest lymphatic organ in the human body.

What is Circulation?

It is the flow of blood through blood vessels, which transport respiratory gases and nutrients. This movement is also responsible for removing waste from different body parts.

Other than these, the circulatory system is also responsible for transmitting hormones from endocrine glands to different organs. They also facilitate the destruction of pathogens and help to remove the body’s metabolic waste.

Notably, there are two types of circulatory systems – 

  1. Open circulatory system

  2. Closed circulatory system

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Fig: Open circulation versus closed circulation

Mechanism of Circulation

In human beings, the heart is responsible for transporting blood all over the body. It comprises two upper chambers – atria or auricles and two lower chambers known as ventricles.

The arteries convey the oxygenated blood from the heart and other parts of the body. On the other hand, the veins send the deoxygenated blood to the heart from different organs.

However, there is an exception to it. To elaborate, the pulmonary vein supplies oxygen-rich blood to the heart, whereas the pulmonary artery takes deoxygenated blood away from it.

Maintenance of blood pressure and increased blood flow to tissues are among the most prominent advantages of double circulation. Also, it creates enough pressure to pump blood to the entirety of the system. 

Find more about the functioning of the heart by referring to quality body fluids and circulation NCERT notes and strengthen your knowledge further.

Disorders of the Circulatory System

These are some common disorders associated with this system –

  • Hypertension or high blood pressure.

  • Cardiac failure.

  • Angina.

  • Coronary Artery Disorder.

Learn more about circulation chapter 12th from our subject experts by joining our live online classes. Also, by accessing our body fluids and circulation notes, you can improve your knowledge significantly. Likewise, if you are a NEET aspirant, you can access our body fluids and circulation NEET notes and boost your preparation significantly. 

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FAQ (Frequently Asked Questions)

1. How Many Types of Body Fluids are There?

Ans. There are 7 types of body fluids, namely – blood, gastric juices, mucus, cerebrospinal fluid, saliva, semen and urine.  Body fluids and circulation are related, through circulation fluids help to regulate body temperature and water content, facilitates digestion, etc. 

2. What is the Significance of Double Circulation?

Ans. It ensures proper blood circulation within the body without getting oxygen-rich blood mixed with the deoxygenated one. Furthermore, this separation between the two types of blood supplies oxygen to blood cells and increases blood flow. 

3. What are the Components of the Circulatory System?

Ans. Its major components include – heart, lungs, veins, arteries, portal vessels and coronary.