Blood

Question 1

What are the functions of the blood?

Answer 1

1. Gas exchange
2. Nutrients and waste products
3. Transport of hormone
4. Maintenance of body temperature
   Defence mechanisms

Question 2

Leukocytes (white blood cells)

Answer 2

<1% of total blood and involved in the immune system

Nucleated cells

Question 3

5 types of leukocyte

Answer 3

Lumphocytes 
Neutrophills 
Monocytes 
Eosinophils 
Basophils

Question 4

Throbocytes (platelets)

Answer 4

Not technically cells 
Irregular shaped, fragments of cytoplasm of megakaryocytes 
No nucleus 
Involved in blood clotting 
Around a 10 day lifespan

Question 5

Erythrocytes ( red blood cells)

Answer 5

Facilitates transport of gases 
No nucleus or mitochondria 
Complex structure (biconcave shape)
Thin and flexible to squeeze through capillaries 
Around 120 day lifespan

Question 6

What is haematopoiesis?

Answer 6

is the production of new blood cells
Must be constantly renewed
Controlled by cytokines
Can make all types of blood cells

Question 7

What is Erythropoiesis ?

Answer 7

formation of new erythrocytes

Question 8

What is Leukopoiesis

Answer 8

Formation of new leukopoiesis

Question 9

Process of haematopoiesis

Answer 9

Begins in the embryo
continue in all bone marrow to around 5yrs
Continue through life in active bone marrow