NCERT Solutions for Class 11 Biology Chapter 18

Body Fluids and Circulation Class 11

Chapter 18 Body Fluids and Circulation Exercise Solutions

<< Previous Chapter 17 : Breathing and Exchange of Gases Next Chapter 19 : Excretory Products and their Elimination >>

Exercise : Solutions of Questions on Page Number : 289

Q1 :  

Name the components of the formed elements in the blood and mention one major function of each of them.


Answer :

The component elements in the blood are:

(1) Erythrocytes:

They are the most abundant cells and contain the red pigment called haemoglobin. They carry oxygen to all parts of the body. Red blood cells are produced continuously in some parts of the body such as the marrow of long bones, ribs, etc. There are about 4 - 6 million RBCs per cubic millimetre of blood.

(2) Leukocytes

Leucocytes are colourless cells. These cells do not contain haemoglobin. They are the largest cells of the body and are divided into two main categories.

(a) Granulocytes

These leucocytes have granules in their cytoplasm and include neutrophils, eosinophils, and basophiles. Neutrophils are phagocytic cells that protect the body against various infecting agents. Eosinophils are associated with allergic reactions, while basophiles are involved in inflammatory responses.

(b) Agranulocytes

Lymphocytes and monocytes are agranulocytes. Lymphocytes generate immune responses against infecting agents, while monocytes are phagocytic in nature.

(3) Platelets

Platelets are small irregular bodies present in blood. They contain essential chemicals that help in clotting. The main function of platelets is to promote clotting.

Answer needs Correction? Click Here

Q2 :  

What is the importance of plasma proteins?


Answer :

Plasma is the colourless fluid of blood which helps in the transport of food, CO2, waste products, and salts. It constitutes about 55% of blood. About 6.8% of the plasma is constituted by proteins such as fibrinogens, globulins, and albumins.

Fibrinogen is a plasma glycoprotein synthesised by the liver. It plays a role in the clotting of blood.

Globulin is a major protein of the plasma. It protects the body against infecting agents.

Albumin is a major protein of the plasma. It helps in maintaining the fluid volume within the vascular space.

Answer needs Correction? Click Here

Q3 :  

Match column I with column II:

Column I

Column II

(a)

Eosinophils

(i)

Coagulation

(b)

RBC

(ii)

Universal Recipient

(c)

AB Group

(iii)

Resist Infections

(d)

Platelets

(iv)

Contraction of Heart

(e)

Systole

(v)

Gas transport


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q4 :  

Why do we consider blood as a connective tissue?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q5 :  

What is the difference between lymph and blood?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q6 :  

What is meant by double circulation? What is its significance?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q7 :  

Write the differences between:

(a) Blood and Lymph

(b) Open and Closed system of circulation

(c) Systole and Diastole

(d) P-wave and T-wave


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q8 :  

Describe the evolutionary change in the pattern of heart among the vertebrates.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q9 :  

Why do we call our heart myogenic?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q10 :  

Sino-atrial node is called the pacemaker of our heart. Why?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q11 :  

What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q12 :  

Define a cardiac cycle and the cardiac output.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q13 :  

Explain heart sounds.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q14 :  

Draw a standard ECG and explain the different segments in it.


Answer :

Please Register/Login to get access to all solutions Facebook Login
<< Previous Chapter 17 : Breathing and Exchange of Gases Next Chapter 19 : Excretory Products and their Elimination >>

Biology : CBSE NCERT Exercise Solutions for Class 11th for Body Fluids and Circulation will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

Popular Articles