Human Bio Unit 2 - Blood

Question 0

3 layers in blood

Answer 0

Plasma (yellow)

White blood cells and platelets (blue/grey)

Red blood cells (red)

Question 1

Where is blood produced?

Answer 1

Inside bone marrow

Question 2

What’s the plasma made up of?

Answer 2

90% water

10% substances

Question 3

Roles of the plasma

Answer 3

Transports substances around the body

Question 4

What does plasma transport?

Answer 4

Urea from liver to kidneys

Hormones

Antibodies

Question 5

White blood cells

Answer 5

Important for defence:

Lymphocytes - produce antibodies and antitoxins

Phagocytes - engulf and destroys pathogens

Question 6

How many white blood cells are there per ml of blood?

Answer 6

5000 to 7000

Question 7

How platelets clot blood

Answer 7

Enzyme released at the site of the cut

Coverts soluble blood protein fibrinogen into insoluble fibrin

Forms blood clot

Question 8

How many platelets are there per ml of blood?

Answer 8

200,000 to 300,000

Question 9

Red blood cells layer

Answer 9

45% of blood volume in healthy people

Transport oxygen from lungs to cells

4 to 6 million per ml of blood