Cariovascular and respiratory systems Flashcards Preview

A level PE > Cariovascular and respiratory systems > Flashcards

Flashcards in Cariovascular and respiratory systems Deck (95)
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1

What is the Pulmonary circuit ?

Circulation of blood through the pulmonary artery to the lungs and pulmonary vein back to the heart

2

What is the systemic circuit ?

Circulation of blood through the aorta to the body and vena cava back to the heart

3

What happens if the body's cardiovascular system is efficient ?

Greater the capacity to transport oxygen to the muscles and the greater the capacity to remove waste products from the muscles eg carbon dioxide and lactic acid

4

What are the chambers called in the heart ?

Atriums

Ventricles

5

Why is it important that the heart is separated ?

To keep the oxygenated and deoxygenated blood separate.

6

Describe the left side of the heart ?

Thick muscular wall which can contract with more force to circulate oxygenated blood from the lungs through the large systemic system circuit to muscles and organs

7

Describe the right side of the heart ?

Contracts to circulate deoxygenated blood from the body through the pulmonary circuit to the lungs

8

What is the path of the blood through the Heart ?

Left side of Heart - Blood is oxygenated at the lungs brought back to the left atria through the pulmonary vein.

Oxygenated blood moves from the left atria , through the left AV valve into the left ventricle. To be force out of the heart via the aorta.

Right side - Deoxygenated blood from the muscles and organs arrive back at the right atria through the vena cava. It moves right through the AV valve ( tricuspid ) into the right ventricle.

The blood is forced out by the pulmonary artery which carries blood back to lungs.

9

What is oxygenated blood ?

Blood saturated with oxygen and nutrients

10

What is deoxygenated blood ?

Blood depleted of oxygen , saturated with carbon dioxide an waste products

11

What is the conduction system ?

A set of structures in the cardiac muscle which create and transmit electrical impulses.

12

What is Myogenic ?

The capacity of the heart to generate its won electrical impulses, which cause cardiac muscle to contract.

13

What are the 5 structures in the conduction system ? ( in order)

SA node
AV node
Bundle of his
Bundle of branches
Purkyne fibres

14

SA node ?

Located in the right atria wall

generates electrical impulse and fires it through atria walls , causing them to contract.

Fire rate will determine heart rate

15

AV node ?

AV node collects impulse and delays it for 0.1 seconds to allow atria to finish contracting

Then releases impulse to bundle of his

16

Bundle of his ?

Located in the septum of the heart , the bundle of his splits the impulse in two.

To distribute to different ventricles

17

Bundle branches ?

Carry the impulse to the base of ventricle

18

Purkyne fibres ?

Distribute the impulse through ventricle walls causing them to contract

19

Define Diastole ?

The relaxation phase of cardiac muscle where the chambers fill with blood

20

Define systole

Contraction phase of cardiac muscle where the blood is forcibly ejected into the aorta and pulmonary vein.

21

What is the cardiac cycle ?

The process of cardiac muscle contracting and the movement of blood through its chambers.

22

How does diastole effect the cardiac cycle ?

Atria and ventricles relax , they expand drawing blood into the atria

The pressure in the atria increases opening valves

Blood passively enters the ventricles

SL valves are closed to prevent blood from leaving the heart

23

What are the three stages of the cardiac cycle ?

Diastole

Atrial systole

Ventricular systole

24

Atrial systole ?

The atria contract , forcing remaining blood from leaving the heart

25

Ventricular systole ?

Ventricles contract , increasing the pressure closing the AV valves to prevent backflow into the atria

SL valves are forced open as blood is ejected from the ventricles into the aorta and pulmonary artery

26

What is heart rate ?

The number of times the heart beats per minute

27

What is stroke volume ?

The volume of blood ejected from the left ventricle per beat

28

What is cardiac output ?

Volume of blood ejected from the ventricle per minute

29

Equation for cardiac output ?

HR X SV

30

What is bradycardia ?

A resting heart rate below 60 bpm