cardiovascularhayopatic

at the instant following the second heart sound, which heart valves are open?

• both atrioventricular valves and semilunar valves

• semilunar valves

• atrioventricular

• all valves are open

the right atrium

• is the location of the pacemaker cells of a normal heart

• prevents blood flow from the right ventricle to the right atrium

• prevent blood flow from the left ventricle to the left atrium

• prevent blood flow from pulmonary artery to the right ventricle

• prevent blood flow from the aorta to the left ventricle

which of these is not a characteristic of cardiac muscle

• rich in mitochondira

• striated

• special cell to cell contact called intercalated

• can develop a significant oxygen debt

• elongated, branching cells usually within one nucleus

in term of being open or closed what is the state of mitral and tricuspid valves (left and right atrioventricular valve, respectively) at the end of the first heart sound

• mitral is closed, tricuspid is open

• mitral is open. tricuspid is closed

• both are open

• both are closed

choose the correct sequence of the action potential conduction along the conductive tissue of the heart:

• SA node > AV node > bundle of his > purkinje fibers > bundle branches

• SA node > AV node > bundle of his > bundle branches > purkinje fibers

• SA node > AV node > bundle branches > bundle of his > purkinje fibers

• SA node > AV node > purkinje fibers > bundle of his > bundle branches

which of these statement about coronary arteries is true

• the left coronary artery supplies the anterior wall of the heart and most left ventricle

• a heart attack occurs if a coronary artery is block

• the right coronary artery supplies most of the right ventricle

• blood flow through the coronary arteries is greatest during ventricular diastole (relaxation)

• all of the choice is correct

if the left bundle branch is damaged, what would be the effect on the activity of the heart?

• weak or absent contraction of the left atrium

• week or absent contraction on the left ventricle

• sustained contraction of the left side of the heart

• increased stimulation of the left ventricle

which of the following is True of cardiac muscle

• cardiac muscle tissue has slow Ca2+ voltage gates in the membrane that makes cardiac muscle incapable of tetanus

• cardiac muscle tissue has both an intracellular and extracellular source of Ca2+

• in cardiac muscle tissue, excitation spreads from cell via intercalated disk

• cardiac muscle tissue does not require nerve activity to stimulate a contraction

• all of the choice are correct

The pulmonary semilunar valve

• is the location of the pacemaker cells of a normal heart.

• prevents blood flow from the right ventricle to the right atrium.

• prevents blood flow from the left ventricle to the left atrium.

• prevents blood flow from the pulmonary artery to the right ventricle.

• prevents blood flow from the aorta to the left ventricle.

Which of these valves is found between the right atrium and the right ventricle?

• Bicuspid valve
• Pulmonary valve
• Aortic valve
• Tricuspid valve