NCERT Solutions for Class 11 Biology Chapter 18 - Body Fluids and Circulation


NCERT Solutions for Class 11 Biology Chapter 18 - Body Fluids and Circulation: You have learned that all living cells have to be provided with nutrients, O_2, and other essential substances. Also, the waste or harmful substances produced, have to be removed continuously for healthy functioning of tissues. It is, therefore, essential to have efficient mechanisms for the movement of these substances to the cells and from the cells. Different groups of animals have evolved different methods for this transport. Simple organisms like sponges and coelenterates circulate water from their surroundings through their body cavities to facilitate the cells to exchange these substances. More complex organisms use special fluids within their bodies to transport such materials. Blood is the most commonly used body fluid by most of the higher organisms including humans for this purpose. Another body fluid, lymph, also helps in the transport of certain substances.

In NCERT Class 11 Biology Chapter 18 - Body Fluids and Circulation, you will learn about the composition and properties of blood and lymph (tissue fluid) and the mechanism of circulation of blood is also explained herein

Here are the important topics of Class 11 Biology Chapter 18 - Body Fluids and Circulation mentioned below:

18.1 Blood

18.1.1 Plasma

18.1.2 Formed Elements

18.1.3 Blood Groups ABO grouping Rh grouping

18.1.4 Coagulation of Blood

18.2 Lymph (Tissue Fluid)

18.3 Circulatory Pathways

18.3.1 Human Circulatory System

18.3.2 Cardiac Cycle

18.3.3 Electrocardiograph (ECG)

18.4 Double Circulation

18.5 Regulation of Cardiac Activity

18.6 Disorders of Circulatory System

Chapter 18 - Body Fluids and Circulation of Class 11th Biology will also tell you that, we have a complete double circulation, i.e., two circulatory pathways, namely, pulmonary and systemic are present. The pulmonary circulation starts by the pumping of deoxygenated blood by the right ventricle which is carried to the lungs where it is oxygenated and returned to the left atrium.

The systemic circulation starts with the pumping of oxygenated blood by the left ventricle to the aorta which is carried to all the body tissues and the deoxygenated blood from there is collected by the veins and returned to the right atrium. Though the heart is auto excitable, its functions can be moderated by neural and hormonal mechanisms.

After going through NCERT Class 11 Biology Chapter 18 - Body Fluids and Circulation, line by line you must be able to answer the following questions:

  • Q1. Name the components of the formed elements in the blood and mention one major function of each of them.
  • Q2. What is the significance of the atrio-ventricular node and atrioventricular bundle in the functioning of the heart?
  • Q3. Describe the evolutionary change in the pattern of heart among the vertebrates.

If you have any doubt in answering these questions then, don't worry NCERT Solutions for Class 11 Biology Chapter 18 - Body Fluids and Circulation will help you in answering them by understanding the concept behind it.

Also, try to answer all the questions mentioned in Chapter 18 - Body Fluids and Circulation, as Solutions for NCERT Class 11 Biology Chapter 18 - Body Fluids and Circulation will help you in the preparation of other competitive exams like NEET and JIPMER along with your school exams.

NCERT Solutions for Class 11 Biology Chapter 18 Body Fluids and Circulation- Solved Exercise Questions

NCERT Solutions for class 11 Biology


The Living World


Biological Classification


Plant Kingdom


Animal Kingdom


Morphology of Flowering Plants


Anatomy of Flowering Plants


Structural Organisation in Animals


Cell: The Unit of Life




Cell Cycle and Cell Division


Transport in Plants


Mineral Nutrition


Photosynthesis in Higher Plants


Respiration in Plants


Plant Growth and Development


Digestion and Absorption


Breathing and Exchange of Gases


Excretory Products and their Elimination


Locomotion and Movement


Neural Control and Coordination


Chemical Coordination and Integration

NCERT Solutions for Class 11- Subject wise

NCERT Solutions for Class 11 Biology

NCERT Solutions for Class 11 Maths

NCERT Solutions for Class 11 Chemistry

NCERT Solutions for Class 11 Physics


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