Unit 2 - KA6 - The structure of the heart Flashcards
Which named blood vessels in the heart transport oxygenated blood.
Pulmonary veins, Aorta
Which named blood vessels in the heart transport deoxygenated blood.
Vena Cave, Pulmonary arteries
what do valves in the heart do?
prevent the backflow of blood.
what are the 2 main valves in the heart?
Semilunar , and AV valves
cardiac output
volume of blood pumped out of each ventricle per minute.
formular for cardiac output
CO = HR X StrokeVolume
cardiac cycle
the pattern of contraction and relaxtion in one complete heartbeat
Atrial Systole
the contraction of both atria transfering the remainder of the blood through the AV valves and into the ventricles
Ventricular systole
Closes the AV valves and pumps the blood out the ventricals and through the SL valves.
average length of one cardic cycle
0.8sec
sino-atrial node (SAN) location
in the wall of the right atrium
where are the electrical impulses from SAN directed towards
passed through the atria , to the atrio-ventricular node (AVN)
atrio-ventricular node (AVN) location
in the centre of the heart
where are the electrical impulses from (AVN) directed towards?
through connecting fibres in the center wall to the muscle fibres in the ventricle
what is happening in the P wave
impulses spreading over the atria from the SAN
what is happening in the QRS complex
impulses through the ventricles
what is happening in the T wave
Electrical recovery of the ventricles at the end of ventricular systole
order of letter in an electrocardiogram
P Q R S T
