Human A&P

Stroke volume is the a. amount of the blood pumped by the heart per minute b. difference between end diastolic and end systolic volume c. difference between the amount of blood pumped at rest and that pumped at maximum output d. amount of blood pumped from the atria into the ventricles

b

T waves on an ECG represent a. depolarization of the ventricles b. repolarization of the ventricles c. depolarization of the atria d. repolarization of the atria

b

Cardiac output is defined as a. blood pressure times peripheral resistance b. peripheral resistance times heart rate c. heart rate times stroke volume d. stroke volume times blood pressure e. blood pressure minus peripheral resistance

c

During the transmission of action potentials through the conduction system of the heart, there is a temporary delay at the a. bundle branches b. Purkinje fibers c. AV node d. SA node e. AV bundle

c

The valve located between the right atrium and the right ventricle is the a. aortic semilunar valve b. pulmonary semilunar valve c. tricuspid valve d. bicuspid valve

c

the bulk of the heart wall is a. epicardium b. pericardium c. myocardium d. endocardium e. exocardium

c

Increased venous return results in a. increases stroke volume b. increased cardiac output c. decresed heart rate e. both a and b

d

pressure in the aorta is at its lowest a. at the time of the first heart sound b. at the time of the second heart sound c. just before the AV valves open d. just before the semilunar valves open

d

Action potentials pass from one cardiac muscle cell to another a. through gap junctions b. by a special cardiac nervous system c. because of the large voltage of the action potentials d. because of the plateau phase of the action potentials e. by neurotransmitters

a

Just after the dicrotic notch on the aortic pressure curve a. the pressure in the aorta is greater than the pressure in the left ventricle b. the pressure in the left ventricle is greater thanth epressre in the aorta c. the pressure in the left atrium is greater than the pressuer in the left ventricle d. the pressure int he left atrium is greater than the pressure in the aorta e. blood pressure int he aorta is 0 mm HG.

a

Purkinje fibers a. are specialized cardiac muscle cells b. conduct impulses much more slowly than ordinary cardiac muscles c. conduct action potentials through the atria d. connect the SA node and the AV node e. ensure that ventricular contraction starts at the base of the heart

a

The "lubb" sound (first heart sound) is caused by a. closing of the AV valves b. closing of the semilunar valves c. blood rushing out of the ventricles d. filling of the ventricles e. ventricular contraction

a

The greatest amount of ventricular filling occurs during a. the first one third of diastole b. the middle one third of diastole c. the last one third of diastole d. ventricular systole

a

The papilary muscles a. are attached to the chordae tendinae b. are found in the atria c. contract to close the foramen ovule d. are attached to the semi lunar valves e. surround the openings of the coronary arteries.

a

While the semilunar valves are open during a normal cardiac cycle, the pressure in the left ventricle is: a. higher than the pressure in the the aorta b. lower than the pressure in the aorta c. the same as the pressure in the left atrium d. lower than the pressure in the left atrium

a

Blood flows neither into nor out of the ventricles during a. the period of isovolumetric contraction b. the period of isovolumetric relaxation c. diastole d. systole e. both a and b

e

Cardiac muscles has a. sacromeres b. a sarcoplasmic reticulum c. transverse tubules d. many mitochondria e. all of these

e

which of these structures returns blood to the right atrium a. coronary sinus b. inferior vena cave c. superior vena cava d. both b and c e. All of these

e