Blood flow
Outline the order that blood flows through each part of the heart, lungs and body.
Outline the events that occur in one complete beat of the heart (the cardiac cycle).
Calculate cardiac output using heart rate and stroke volume
define cardiac
Explain series of event
Cardiac cycle - the series of events that take place in the heart over the duration of a single heart beat.
Systole | The pumping phase of the cycle, when the heart muscle contracts, is called systole. |
Diastole | The filling phase, as the heart muscle relaxes, is called diastole. |
Atrial systole | ventricular Systole | Diastole | |
Chambers | Atrium contracts Ventricle relax | Atrium relax Ventricle contracts | Atrium relaxed Ventricle relaxed |
Blood flow | From artrium to ventricle | From ventricle to aorta | Into atirum and ventricle |
Valves | A valve open Aortic valve close | Av vavle close Aortic valve open | A valve open Aortic valve close |
For a short time, both atria and ventricles are in diastole.
Blood flow
Vasodilation | Arteries open and allow more blood to reach |
Vasocontrictrion | Arteries constrict and allow less blood to reach |
To maintain homeostasis
due to changes in the external environment
Cardiac output - how quickly blood flows around the body depending on how fast heart is beating (Stroke volume) and how much blood pumps with each beat (heart rate)
Heart rate Number of times hear beat per min
Stroke volume blood forced from ventricle of hear with each contraction
Cardiac output (mL/min = stroke volume (mL) x heart rate (beats/min)