Advertisements
Advertisements
प्रश्न
Describe the composition and functions of blood.
उत्तर
Blood is a fluid connective tissue. In blood, cells move in a medium called blood plasma.
It is composed of following three types of blood cells:
(a) RBCs (red blood corpuscles) or erythrocytes.
(b) WBCs (white blood cells) or leucocytes.
(c) Platelets.
RBCs and WBCs are living, while plasma and platelets are non-living. Blood plasma is a complex fluid consisting of inorganic salts and organic compounds. Albumins, globulins, fibrinogen, glucose, amino acids, lipids, enzymes, hormones, and waste materials are the organic substance of plasma.
WBCs consist of phagocytes (granulocytes and agranular leucocytes) and immunocytes.
Functions :
1. Blood transports nutrients, hormones and vitamins to the tissues and transports excretory products from the tissues to the liver and kidney.
2. The red blood corpuscles (RBCs) carry oxygen to the tissues for the oxidation of food stuff.
3. The white blood cells (WBCs) fight disease either by engulfing and destroying foreign bodies or by producing antitoxins and antibodies that neutralise the harmful effects of germs.
4. Blood platelets disintegrate at the site of injury and help in the clotting of blood.
APPEARS IN
संबंधित प्रश्न
What are the cellular components of blood?
Give three functions of blood.
Classify connective tissue and give one example of each type.
Name the tissues found:
at the joints of two bones
Higher Order Thinking Skill.
What is the consequence that occur if all blood platelets are removed from the blood?
Which of the following helps in repair of tissue and fills up the space inside the organ?
Cork cells are made impervious to water and gases by the presence of
Write a note on blood and its components.
In which one of the following preparations you are likely to come across cell junction most frequently?
What is special about tissue present in the heart?
