Heart And Circulatory System Flashcards
Myocardium and blood
Heart wall. Has own arteries - r and l coronary arteries
Nb long term benefit of cardio tr is slower diastole rate so better bl supply fewer beats)
Ventricles pump blood how
L vent oxy bl to body via Aorta
VC takes deoxy bl from tissues to R atrium
Pul Art takes deoxy bl from R vent to lungs
Pul Veins take oxy bl from lungs to L Atrium
and on and on….
Narrowed or blocked arteries =?
Angina or if total block M I - result of CHD build up of fatty deposits
Short term benefits of cardio exe
Stroke/heart rate i.e. cardiac output increased
Systolic bp up as myocardium contracts better but
Diastolic bp same or down
Better O2/CO2 exchange so muscles more O2
Resp rate up
Increased blood flow to muscles
Bl to muscles more
Long term benefits of cardio exe
Resting hr down - fitter = fewer beats more blood Cardiac o.put up Cardiac bl supply up Cardiac muscle stronger Lung caps increased Lungs dead space utilised O2/CO2 exchange better Bl circulation better Red bl count up Haemoglobin up Artery wall tone better Circulation better Mitochondria bigger and more Aerobic/anaerobic enzymes increased
Circumflex artery
A branch of the left coronary artery, supplying the left posterior area of the myocardium.
Myocardium is what?
Heart muscle (no direct chambers to it) therefore heart has own set of arteries to keep the myocardium supplied with oxy blood. They are: r and l coronary arteries from aorta Plus the circumflex branch of left coronary artery - the branch splits into two
Stroke volume
Amount of blood leaving heart in one beat
During rest, stroke volume approx 70-80ml per beat
Well trained people can be 100ml or very well trained even 200 ml per beat
Arteriosclerosis
Hardening of the arteries
Artherosclerosis
The build up of fatty deposits in the arteries
