BIOS213L Cardiovascular

the fibrous skeleton of the heart functions to

-maintain the shape of the heart -help distribute the force of contraction of the heart -provide an anchor for the heart valves -strengthen and help prevent overexpansion of the heart

attempting to exhale forcefully against a closed glottis is known as

Valsalvas

the last Korotkoff sound occurs when the blood pressure is equal to the ___ pressure

diastolic

(T/F) a greater pressure in the right ventricle than the aorta causes the pulmonary valve to open

false

(T/F) the ventricles completely empty when they contract in systole

false

(T/F) the first heart sound is produced when the semilunar valve closes

false; its the closure of the atrioventricular (bicuspid and mitral valves)

the first anatomical change associated with atherosclerosis is the appearance of

fatty streaks

what structures keep the AV valves from everting under high ventricular pressure?

papillary muscles and chordae tendineae

the pathway of blood from the heart to the lungs and back to the heart is the ___ circulation

pulmonary

this value indicates the difference between systolic and diastolic pressures

pulse pressure

the QRS complex of the electrocardiogram occurs when

repolarization of the atria occurs

heart sounds may be heard with this instrument

stethoscope

cardiac output = heart rate x ____

stroke volume

the amount of blood ejected by the ventricles per beat is termed the

stroke volume

the highest pressure in the artery is known as

systolic pressure

the second heart sound corresponds to

the closing of the SL valves

the main pacemaker region of the heart is

wall of right atrium

the contraction of any one cardiac muscle fiber

will cause the contraction of several others