Heart Flashcards
valsalva effect on heart
-decreased return of blood to heart, reduced cardia output -abnormal elevation of blood pressure and heart rate
3 types of blood vessels
arteries, veins and capillaries
pulmonary circulation
blood to and from lungs RV>pulmonary artery>lungs>pulmonary veins>heart
cardiac output
amount of blood pumped from heart to aorta in one minute (stroke volume x heart rate)
overload principle
- places stress on heart and lungs
- stimulated adaptation where heart becomes more efficient at pumping blood in each beat
- strkoe volume increases
- heart rate decreases
stroke volume during exercise
increases to meet needs
fit stroke volume
100-110ml per beat
-super fit, closer to 200ml
average stroke volume
70-80ml per beat
High diastolic BP
over 100
target heart rate
60-70bpm
blood cycle
Body>vena cava>RA>RV>pulmonary artery>lungs>pulmonary vein>LA>LV>aorta>body
pulmonary artery
deoxygenated blood form body to lungs
tricuspid valve
opens when RA contracts
right atrium
receives blood from vena cava & sends to RV
sinoatrial node
pacemaker
aortic valve
allows oxygenated blood into the aorta
pulmonary valve
prevents backflow of blood from RV to pulmonary artery
left ventricle
pumps blood to body via aorta
left atrium
receives blood from pulmonary vein
-sends blood to left ventricle
systolic BP
pressure exerted on artery walls when ventricles contract and pump blood to arteries
vena cava
- largest vein in body
- blood from the body to heart
Diastolic pressure
pressure exerted on artery walls when ventricles fill between heartbeats
arteries
- carry blood away from heart to capilleries
- further from heart they become arterioles
- thick muscle walls, smooth muscle, elastic tissue, small internal diameter
decreased blood pressure
venous return decreases heart has less blood to pump, heart contracts less forecefully
high end of normal BP
120/80-140/90
Low BP
90/60 or lower
Blood pressure
amount of pressure exerted on artery walls as blood moves through
white coat hypertension
BP rise from doctor’s office
Blood pressure reading
systolic/diastolic