3.4.1.2: The Cardiac cycle

Question 1

what is the cardiac cycle

Answer 1

a sequence of events that happen in a single heartbeat, consists of the alternating systole and diastole of cardiac muscles

Question 2

in what direction will blood always flow, and how is this managed

Answer 2

down a pressure gradient, change of pressure is managed by the change of volume in chamber - contracting and relaxing cardiac muscles

Question 3

describe the atrial systole

Answer 3

volume of atria decreases, pressure in atria increases, blood flows from atria to ventricles, AV valves are open and SL valves are close

Question 4

describe the ventricle systole

Answer 4

volume of ventricles decreases, pressure in ventricles increases, blood flows from ventricles to arteries, AV valves are close and SL valves are open

Question 5

describe the diastole of atria and ventricles

Answer 5

volume of atria and ventricles increases, pressure in atria and ventricles decreases, blood flows from veins to atria, and and atria to ventricles. AV valves are open and SL valves are close