The Heart

Question 1

What do heart valve do?

Answer 1

Heart valve only open one way and this depends on the pressure

Question 2

Which wall is thicker and why?

Answer 2

The left ventricle is thicker because it creates pressure to pump blood all around the body

Question 3

Why is the cardiac cycle controlled?

Answer 3

So that each chamber only contracts when it is full of blood

Question 4

How can neves effect the heart beat?

Answer 4

The heart is not under any nervous control, but never can sometimes alter with the frequency of the heat beat

Question 5

Where does the blood enter

Answer 5

The atria and ventricles, from pulmonary vein and the vena cava

Question 6

What is the relaxation of the heart called

Answer 6

Diastole

Question 7

What is also relaxed when the blood enters?

Answer 7

The atria are relaxed and filled with blood

Ventricles are also relaxed

Question 8

What happens at the stage two of the heart

Answer 8

Contraction of atria
(Cattail systole)
Atria contact pushing blood into the ventricles (ventricles still relaxed)

Question 9

Where does the blood pump to in stage 3 of the blood flow

Answer 9

The pulmonary arteries and the aorta
Contraction of ventricles systole
Atria is relaxed
Ventricles contract, pushing blood away from the heart through pulmonary arteries and the aorta

Question 10

What is cardiac output

Answer 10

The amount of blood pumped around the body (depends on two factors)

Question 11

What two factors does the cardiac output depend on

Answer 11

The stoke volume

The heart rate

Question 12

What is the stoke volume

Answer 12

The volume of the blood pumped by the left ventricle into each heat beat

Question 13

What is the heat rate

Answer 13

The number of times the heart beats per minute

Question 14

What is a typical value for an adult for their strike volume

Answer 14

75ml

Question 15

What is the typical value for an adult for their heart rate

Answer 15

70 bpm

Question 16

How do we work out cardia output

Answer 16

Stroke volume x heart rate

Question 17

How many chamber does the

Heart have

Answer 17

4

Question 18

Where does the left side of the heart pump blood to

Answer 18

To the rest of the body

Head to toe

Question 19

Where are semi-loner valves found

Answer 19

Found in the pulmonary artery

Question 20

Why are aorta important

Answer 20

Because they prevent the blood from going backwards

Question 21

Where does the pulmonary artery take the blood to

Answer 21

The lungs

Question 22

What is cardiac muscle

Answer 22

It ks myogenic- this means it can contract without receiving signals from yen nerves

Question 23

Why do people have artificial pacemakers

Answer 23

Because they have an irregular heart beat

Question 24

Where are artificial pacemaker implanted

Answer 24

Under the skin, Chest area , where a wire is connected through the vein to the right atrium.

Pacemaker sends impulses to the heart muscles, making it contract at the correct rhythm

Question 25

What happens if the AVN is damaged

Answer 25

The impulses don’t travel to the ventricles

Pacemaker wire is connected to ventricles, making is contract

Question 26

How often must pacemaker be replaced

Answer 26

By every 10 years

Question 27

What type of oxygen does the left side pump

Answer 27

Oxygenated

Question 28

What type of oxygen does the right side pump

Answer 28

Deoxygenated