Circulatory System

Question 1

Components of blood

Answer 1

1.red blood cells
2.white blood cells
3.platelets
4.plasma

Question 2

Function of plasma

Answer 2

to transport chemicals and heat

Also carries the red blood cells, white blood cells,and platelets

Question 3

Platelets

Answer 3

Function: help to form blood clots

When a blood vessel is injured, platelets help to form a clot
• Clotting prevents loss of blood, and prevents micro- organisms getting in
• Clots are temporary barriers while repair and healing is taking place.

Question 4

Systems of tubes+pump

Answer 4

They come in three main types:
Arteries
Veins
Capillaries

Question 5

Arteries

Answer 5

Arteries
• Carry blood AWAY from the heart
• Flow of blood is strong and at high pressure
• Artery walls are thick and strong to withstand this pressure

Question 6

Veins

Answer 6

• Carry blood BACK to the heart
• Flow of blood is weaker and pressure is low
• Vein walls are thinner and weaker than artery walls

Question 7

Capillaries

Answer 7

• These are tiny blood vessels
• There are a huge number of them in the body
• Capillaries are found between arteries and veins

Question 8

The Heart

Answer 8

• Function: pumps blood around the body
• It pumps blood by contracting periodically
• Cardiac muscle provides the contraction
• Unlike regular muscle, cardiac muscle doesn’t tire easily

Question 9

Two blood circuits
Number 1

Answer 9

1:pulmonary circulation
-blood leaves the heart
-goes to the lungs to become oxygenated
-returns to the heart

Question 10

Two blood circuits
Number 2

Answer 10

2: Systemic Circulation
-blood leaves the heart
-travels to all other parts of the body
-returns to the heart