The Heart

Question 1

What is your heart?

Answer 1

Your heart is a muscular organ which pumps blood through the blood vessels of the circulatory system.

Question 2

How many bpm does your heart do throughout your lifetime?

Answer 2

70 bpm

Question 3

True or False
Your heart is actually just two pumps. The right side of your heart is one pump and the left side of your heart is another pump.

Answer 3

True

Question 4

How many chambers does your heart have?

Answer 4

2

Question 5

What are the upper chambers of the heart called?

Answer 5

Atria (Sing. Atrium)

Question 6

What do the atria do?

Answer 6

Blood empties into them from veins and when the atria contract they pump blood into the lower chambers.

Question 7

What are the lower chambers of the heart called?

Answer 7

Ventricles

Question 8

What do the ventricles do?

Answer 8

They have much more muscular walls. When the ventricles contract they pump blood out into arteries.

Question 9

What is between each atrium and ventricle?

Answer 9

A valve

Question 10

What does the valve do?

Answer 10

The valve prevents the blood flowing back into the atrium when the ventricle contracts.

Question 11

Why do the ventricles have more muscular walls than the atria?

Answer 11

This is because blood is pumped out of the heart at greater pressure from these chambers compared to the atria.

Question 12

Why does the left ventricle have more muscular wall than the right?

Answer 12

This is because the left ventricle has to pump blood all the way around the body, whereas the right ventricle only has to pump it to the lungs.

Question 13

When does the heart pump blood?

Answer 13

When it’s muscles contract.

Question 14

What happens the muscles contract and relax?

Answer 14

Contract- the chamber gets smaller and squeezes the blood out. Relax- it fills up with blood again.

Question 15

True or false
The 2 sides of the heart work together. The atria contract and relax at the same time. The ventricles contract and relax at the same time.

Answer 15

True

Question 16

What is diastole?

Answer 16

When the heart muscles are relaxed. Blood flows into the atria from the veins.

Question 17

What is systole?

Answer 17

When the heart muscles contract

Question 18

How does blood leave the heart?

Answer 18

• First the atria contract and force the blood into the ventricles
• The valves between the atria and the ventricles open due to the pressure of blood against them
• The ventricles then contract and force the blood into the arteries
• The valves close to prevent blood from flowing back into the atria.

Question 19

What does the right ventricle do?

Answer 19

It pumps blood to the lungs in the pulmonary artery.

Question 20

What does the left ventricle do?

Answer 20

It pumps blood to the rest of the body in the Aorta (main artery)

Question 21

What happens in the right atrium?

Answer 21

Deoxygenated blood returns to the right atrium in the main veins cava (main vain).

Question 22

What happens in the left atrium?

Answer 22

Oxygenated blood returns to the left atrium in the pulmonary vein.