The Heart Flashcards

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1
Q

What do heart valve do?

A

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

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2
Q

Which wall is thicker and why?

A

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

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3
Q

Why is the cardiac cycle controlled?

A

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

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4
Q

How can neves effect the heart beat?

A

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

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5
Q

Where does the blood enter

A

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

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6
Q

What is the relaxation of the heart called

A

Diastole

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7
Q

What is also relaxed when the blood enters?

A

The atria are relaxed and filled with blood

Ventricles are also relaxed

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8
Q

What happens at the stage two of the heart

A

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

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9
Q

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

A

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

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10
Q

What is cardiac output

A

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

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11
Q

What two factors does the cardiac output depend on

A

The stoke volume

The heart rate

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12
Q

What is the stoke volume

A

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

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13
Q

What is the heat rate

A

The number of times the heart beats per minute

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14
Q

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

A

75ml

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15
Q

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

A

70 bpm

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16
Q

How do we work out cardia output

A

Stroke volume x heart rate

17
Q

How many chamber does the

Heart have

A

4

18
Q

Where does the left side of the heart pump blood to

A

To the rest of the body

Head to toe

19
Q

Where are semi-loner valves found

A

Found in the pulmonary artery

20
Q

Why are aorta important

A

Because they prevent the blood from going backwards

21
Q

Where does the pulmonary artery take the blood to

A

The lungs

22
Q

What is cardiac muscle

A

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

23
Q

Why do people have artificial pacemakers

A

Because they have an irregular heart beat

24
Q

Where are artificial pacemaker implanted

A

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

25
Q

What happens if the AVN is damaged

A

The impulses don’t travel to the ventricles

Pacemaker wire is connected to ventricles, making is contract

26
Q

How often must pacemaker be replaced

A

By every 10 years

27
Q

What type of oxygen does the left side pump

A

Oxygenated

28
Q

What type of oxygen does the right side pump

A

Deoxygenated