Heart structure

Question 1

1)

Answer 1

Deoxygenated blood from the body enter the right atrium via the vena cava (main vein)

Question 2

2)

Answer 2

The atrium contracts to push the blood through the tricuspid valve not the right ventricle.

Question 3

3)

Answer 3

The right ventricle contrats and pushes the blood through the semi lunar valve into the pulmonary vein to the lungs. The tricuspid valve is closed to prevent back flow of blood into the right atrium.

Question 4

4)

Answer 4

oxygenated blood from the lungs enters the left atrium via the pulmonary arteries.

Question 5

5)

Answer 5

the atrium contracts to push blood through the bicuspid valve into the left ventricle.

Question 6

6)

Answer 6

The left ventricle contracts and pushes the blood through the semi lunar valve into the aorta (main artery) to the body. The bicuspid valve is closed to prevent back flow of blood into the left atrium.

Question 7

Two factors affecting heart rate

Answer 7

1) exercise
2) adrenaline

Question 8

why does exercise increase heart rate

Answer 8

as contracting muscles need more oxygen and produce more carbon dioxide. The heart beats fasters so that more blood is pumped to the lungs for gas exchange and more blood reaches muscles.

Question 9

Why does adrenaline increase blood rate

Answer 9

the hormone adrenaline from the adrenal glands also increase the heart rate during times of stress or danger.