Advertisements
Advertisements
प्रश्न
Describe the composition and functions of blood.
Advertisements
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
Name the kind of tissue that Binds different tissues together
Classify connective tissue and give one example of each type.
Write the name of the following tissue.
Tissue joining muscles and bones.
Identify the odd word and explain why it is odd.
Name the tissue associated with the following:
A man becoming fat.
Name the tissues found:
at the joints of two bones
Tendon connects ______.
Identify figures A and B.
- ______ epithelium forms the outer lining of the buccal cavity.
- ______ epithelium consists of ceils that are tall and pillar-like.
- Which one allows the diffusion of substances?
- Which is called pavement epithelium?
- Which epithelium lines the gastrointestinal tract and epiglottis
Umbilical cord blood is collected at the time of child birth and stored in stem cell banks? Reason out.
Why are blood, bone and cartilage called connective tissue?
