circulation Flashcards
what is the function of artery ?
carry blood away from the heart
does arteries carry oxygenated or deoxygenated blood ?
oxygenated
what is the lumen size of arteries ?
small
structure of the artery
thick elastic walls - collagen this is for high pressure
- narrow central tube - lumen and smooth
what has valves in them arteries, capillaries or veins ?
vein
what is the function of the capillaries ?
fine networks of tiny tubes linking arteries and veins
does capillaries carry oxygenated or deoxygenated blood ?
both
what is the lumen size for the capillaries ?
small
what is the structure of the capillaries ?
- consists of endothelium only
- thin outer wall - collagen
- wide central tube
what is the function of the vein ?
carry blood back into the heart
does the veins carry oxygenated or deoxygenated blood ?
deoxygenated
what is the lumen size for the veins ?
big
what is the structure for the veins ?
- thin elastic walls
- narrow central tube
structure of the heart
right : pulmonary artery, vena cava, right atrium, tricuspid, right ventricle, semilunar
left : aorta, pulmonary vein, left atrium, bicuspid valve, left ventricle, semilunar valve
why is the left ventricle wall thicker than the right ventricle wall ?
left ventricle pumps blood for all the parts of the body so needs thicker walls for more work to be done
why does mammals require a double circulatory system ?
manage the pressure of blood flow
why does the blood flow through the lungers at a low pressure ?
prevents damage to the capillaries in the alveoli and also reduces the speed at which the blood flows, enabling more time for gas exchange
why does the oxygenated blood from the lungs then go through the heart to be pumped out at a high pressure to the rest of the body ?
ensure that the blood reaches all the respiring cells in the body