Question

Name the following
(i) The term given to the production of blood cells ………..........……….
(ii) The three proteins present in the plasma
(i) ……………. (ii) ……………. (iii) …………….
(iii) Cell fragments of blood involved in the clotting of the blood
………………………………...................................………………….

Answer 1

Answer:

These blood-forming stem cells make copies of themselves, and they also produce mature blood cells.

Explanation:

Blood cells are made in the bone marrow . That's a spongy tissue located inside some bones. ... These blood-forming stem cells can grow into all 3 types of blood cells – red cells, white cells and platelets.

Answer 2

Answer:

1. haematopoiesis.
2. i)albumin ii) globulins iii) fibrinogen.
3. Thrombocytes (blood platelets).

Explanation:

Haematopoiesis is the term given to the formation of blood cells. Bone marrow is the site of haematopoiesis in an individual since the last three months before birth. Before this, it occurs in the yolk sac of an embryo and then in the liver, spleen ,thymus and lymphnodes of a foetus. As an individual ages rate of haematopoiesis decreases.

Blood plasma comprises mostly of water (90-92%) and rest of it are solutes, which are mainly proteins. Some plasma proteins are found in many body parts but a few are confined to plasma. Most of the plasma proteins are secreted by liver cells or hepatocytes and are mainly albumins, globulins and fibrinogen..

Platelets are fragments of megakaryocytes that are produced along with erythrocytes (RBCs) and leukocytes (WBCs). These lack nuclei.Platelets prevent blood loss by promoting blood clotting. when forming a clot they also secrete serotonin that act as a vasoconstrictor.