Biology- The Heart

Question 1

How does the heart pump blood around the body

Answer 1

Using a double circulatory system

Question 2

What are the four chambers in the heart

Answer 2

-left and right atria
- left and right ventricles

Question 3

What do the Atrias do

Answer 3

Recieve blood from the veins

Question 4

What do the ventricles do

Answer 4

Pump blood into the arteries

Question 5

How does heart pump blood (6 marks)

Answer 5

1. Blood enters through the atria
2. They contract and force blood into the ventricles
3. The ventricles contract and force blood out of the heart
4. Valves make sure the blood flows in the right direction
5. The heart rate is controlled by a group of cells in the right atrium called the pacemakers

Question 6

What are arteries for

Answer 6

. They transport blood from your heart to your organs
. They have thick walls made of muscle and elastic fibres

Question 7

What are valves for

Answer 7

• they transport blood from your organs to your heart
• they have thinner walls with valves to stop the backflow

Question 8

What are capillaries for

Answer 8

-They allow substances needed by the cells to pass out of the blood
-they allow substances produced by the cells to pass into the blood
- narrow and thin-walled blood vessels