cardiac cycle

Question 1

what’s the unidirectional flow of blood advantages

Answer 1

ensures maximum efficiency in the delivery of oxygen and nutrients to cells and removal of waste products ensuring that oxygenated and deoxygenated blood don’t mix
if they mix then the less oxygen in blood at capillaries

Question 2

what’s systole and diastole

Answer 2

systole - contracts
diastole - relaxes

Question 3

whole heart diastole

Answer 3

heart relaxes and pressure drops
blood fills the atria from the veins (passive re filling)

Question 4

atrial systole

Answer 4

cardiac muscle in the atria contract
pressure increases
high pressure in the atria than the ventricles so then the atria-ventricular valve opens
blood forced into ventricle
valves in veins stop blood going back

Question 5

ventricular systole

Answer 5

ventricles contract from the base inward causing increase in pressure
ventricular pressure is higher than atria pressure shutting av valve
ventricular pressure is higher than the aorta opening semilunar valve blood is then forced through

Question 6

explain systole and diastole of ventricle on the elastic arteries

Answer 6

elastic recoil of arteries mean that they initially expand to accommodate the high volume of blood forced out ventricles
but then recoil decreasing the diameter of the vessel again maintaining high blood pressure and ensuring blood flow away from heart (ventricular dystole)