TEST 3 - CARDIO Flashcards
_______ node is the pace maker: 60 to 100 beats per minute
SA
________ node takes over when SA node fails: 40 to 60 beats per minute
AV
DEFINITION
inflammation of the heart valves
endocarditis
DEFINITION
really thick layer under endocardium
myocardium
DEFINITION
outside layer of the heart
pericardium
Coronary Circulation
____________ has its own blood supply.
Heart
Coronary Circulation
The heart needs a continuous source of ___________.
oxygen
WHICH BLOOD VESSELS provide heart with oxygen?
coronary arteries
this structure, located in the aorta, is where the blood supply originates.
sinus of Valsalva
HEART RATE + STROKE VOLUME = ?
CARDIAC OUTPUT
a hormone system that helps regulate long-term blood pressure and blood volume in the body
Renin-angiotensin-aldosterone system (RAAS)
DIAMETER OF ATERIOLES + RAAS = ?
PERIPHERAL VASCULAR RESISTANCE
BLOOD PRESSURE = ____________ ______________ X _______________ _____________ ______________
CARDIAC OUTPUT
PERIPHERAL VASCULAR RESISTANCE
DEFINITION
volume of blood that is pumped by the heart every minute
Cardiac output
DEFINITION
the amount of blood ejected by the heart with each heartbeat
Stroke volume
______________ ___________ depends on heart rate and stroke volume
CARDIAC OUTPUT
_____________ ___________ depends on contractility
Stroke volume
FACTORS AFFECTING CARDIAC OUTPUT
The volume of blood in the cardiac chamber just prior to systole (end-diastolic volume).
Preload
FACTORS AFFECTING CARDIAC OUTPUT
The force and velocity of cardiac muscle shortening in response to stimuli that increase cytoplasmic free calcium ion levels
Contractility
FACTORS AFFECTING CARDIAC OUTPUT
The impedance or resistance that must be overcome in order to eject blood from a cardiac chamber.
Afterload
DEFINITION
the percentage of blood that is ejected from the ventricles (generally about 55%)
Ejection fraction
ARTERIES OR VEINS?
have more muscle to move blood forward
ARTERIES
ARTERIES OR VEINS? have less muscle than arteries
VEINS
ARTERIES OR VEINS? have valves to prevent backflow and prevent blood from backing up
VEINS