Blood

Question 1

What are the main components of blood?

Answer 1

Plasma (55%), Red blood cells (41%), White blood cells and Platelets (4%)

Question 2

What is plasma and what is it used for?

Answer 2

Pale yellow liquid. Used to carry:
. carbon dioxide from cells to lungs
. dissolved food to cells
. hormones to different parts of the body
. waste from liver to kidneys

Question 3

What are red blood cells and what are they used for?

Answer 3

Cells with no nucleus. They carry oxygen from lungs to cells.

Question 4

What are white blood cells used for?

Answer 4

Fight pathogens that enter the bloodstream.

Question 5

What are platelets used for?

Answer 5

They help blood clot if the skin is cut.

Question 6

How does blood clot?

Answer 6

1. Skin is cut
2. Platelets turn fibrinogen (a protein in blood) into fibrin in contact with air. They form a net over the cut.
3. Red blood cells get trapped in the net which makes a clot and seals the cut.
4. The clot dries into a scab where new skin grown underneath.