1.4.2 blood cells

Question 1

hemoglobin

Answer 1

red blood cells contain haemoglobin, which binds with oxygen in the lungs.
Haemoglobin carries oxygen which will then be released to the body cells to be used for respiration.

Question 2

small size

Answer 2

Red blood cells are small so that they can pass through tiny capillaries.

Question 3

biconcave shape ( red blood cells)

Answer 3

Red blood cells have dents on each side.
We call this a biconcave shape.
This biconcave shape creates a large surface area and allows for the rapid diffusion of oxygen.

Question 4

no nucleus ( red blood cell)

Answer 4

Red blood cells do not have a nucleus. This frees up more room for haemoglobin.
This maximises the amount of oxygen that they can carry.

Question 5

have a nucleus ( white blood cell)

Answer 5

Unlike red blood cells, white blood cells have a nucleus.

Question 6

can change shape ( white blood cells)

Answer 6

White blood cells can change shape.

This allows them to squeeze through the walls of blood vessels into body tissues and to engulf harmful microorganisms.