Blood

Question 1

Constituents

Answer 1

Plasma=55%
Red blood cells = 45%
White blood cells = <1%
Platelets =<1%

Question 2

Myeloid stem cells

Answer 2

From bone marrow

Question 3

Lymphoid stem cells

Answer 3

From lymphatic system

Question 4

Erythrocytes

Answer 4

Red blood cells

Question 5

Features of Red blood cells

Answer 5

1) bioconcave= larger SA for O2
2) flexible membrane to squeeze through capillaries
3) carry hb
4) glycolipids in membrane
5) no nucleus and organelles

Question 6

Erythropoiesis

Answer 6

How red blood cells are made

Question 7

Erythropoiesis method

Answer 7

1) starts as pluripotent stem cell in b.m
2) differentiates into pro erythroblast
3)synthesis of hb
4)nucleus expelled = reticulocyte
5) method stimulated by low 02 levels

6) erthyropoiesis stimulated by low O2 levels
7) juxtaglomerular cells in kidneys detect low O2
8)secretes erythropoietin in blood
9)maturation process in bone marrow is sped up = more rbc

Question 8

Leucocytes

Answer 8

White blood cells

Question 9

Features of White blood cells

Answer 9

1) has nucleus
2) membrane has proteins (antigens) used for immunological processes
3) granular and agranular
4) performs phagocytosis

Question 10

Granular

Answer 10

Filled with granules
From bone marrow

Question 11

Agranular

Answer 11

From lymph system

Question 12

Thrombocytes

Answer 12

Platelets

Question 13

Features of Platelets

Answer 13

1)fragments of megakaryocytes
2) under influence of thrombopoietin in bone marrow
3) disc shaped
4) no nucleus, many vesicles
5) blood clotting (haemostasis)

Question 14

Vesicles (platelets)

Answer 14

Sticky ends to help with clotting