Module 2 - Heart Components Flashcards
Cells, Chemical for Life, Transport and Gas Exchange
1
Q
Aorta:
A
- carries oxygenated blood from left ventricle to the body.
- carries blood at high pressure.
- largest artery.
2
Q
Vena Cava:
A
- carries deoxygenated blood from body to the right atrium.
- largest vein.
- superior vena cava delivers deoxygenated blood from the head.
- inferior vena cava delivers deoxygenated from the rest of the body’s tissues.
3
Q
Pulmonary artery:
A
-carries deoxygenated blood from right ventricle to the lungs.
4
Q
Pulmonary vein:
A
-carries oxygenated blood from lungs to left atrium.
5
Q
Atria:
A
- contract to generate a force to move the blood at low pressure into the ventricles.
- thin muscular walls which contain elastic tissue.
6
Q
Ventricles:
A
- contract to generate a force to move the blood at high pressure out of the heart.
- Left ventricle forces oxygenated blood into aorta - pressure very high as wall is thickest.
- Right ventricle forces deoxygenated blood into pulmonary artery at lower pressure than left ventricle.
7
Q
Atrioventricular valves:
A
- between atrium and ventricle
- LAB RAT
- Left AV = bicuspid (mitral)
- Right AV = tricuspid
8
Q
Bicuspid valve:
A
- prevents backflow of blood from the left ventricle to the left atrium when the ventricle contracts.
- closes when pressure of the left ventricle is greater than the pressure of left atrium.
9
Q
Tricuspid valve:
A
- prevents backflow of blood from the right ventricle to the right atrium when the ventricle contracts.
- closes when pressure of the right ventricle is greater than the pressure of right atrium.
10
Q
Chordae tendinae:
A
- hold AV valves in place.
- attach valves to muscle wall of ventricles.
- prevent valves inverting when under pressure when ventricle contracts.
11
Q
Cardiac muscle:
A
- specialised muscle which does not need nervous stimulation to contract = myogenic.
- coronary arteries supply cardiac cells with nutrients and oxygen.
