Cardiac cycle Flashcards
Description of systolic pressure and what does it do?
(2 points)
Pressure…
Heart contracts….
Pressure exerted on the artery walls
Heart contracts and forces blood out of the heart into the body.
Description of diastolic pressure and what it does?
(2 points)
Pressure…
Heart relaxed…
Pressure on the blood vessel walls
Heart relaxed between beats and filling with blood.
Description of sinoatrial node (SAN) what does it do and cause? (4 points) Walls of... Sends signals.... Causes muscular.... Contraction forces....
In the walls of right atrium,
Sends signals from right atrium through walls of atria
Causes muscular walls to contract
Contraction forces blood within atria down into ventricles.
Description of atrioventricular node (AVN) and what does it do? In centre of heart... Location? Acts as a gate.... Slowing down signal allows what? (3 points)
In centre of heart between atria and ventricles
Acts as a gate that slows down the signal from SAN Slowing down signal, this allows the atria are able to contact before ventricles.
Description of bundle Of His/purkinje fibres and what it does?
Heart muscle cells…
Found in walls…
(2 points)
Heart muscle cells responsible for transporting the electrical impulses from AVN
Found in the walls of ventricles and septum.
What is the cardiac output?
Amount of blood pumped…
(1 point)
Amount of blood pumped through circulatory system in one minute.
