exam 2 anatomy and physiology 2 snead state quizzes

The great cardiac vein and middle cardiac vein empty into a venous cavity called the

coronary sinus.

Baroreceptor reflexes

can change heart rate.

Blood vessels enter and exit from the_________ of the heart.

base

The period of isovolumetric contraction is immediately followed by

the period of ejection

Lowered extracellular K+ levels will lower the heart rate because

the resting membrane potential is hyperpolarized.

All cardiac veins empty into the_________, which then empties into the_________.

coronary sinus; right atrium

What is the foramen ovale?

An opening between the right and left atria in the embryo and fetus

Under resting conditions, the normal stroke volume is approximately_________.

70 mL

Blood in the pulmonary veins returns to the

left atrium.

Which of the following might increase the risk for cardiovascular disease?

Chronic stress

What vessel exits the left ventricle?

Aorta

The ion primarily responsible for depolarization in pacemaker cells is_________, whereas the ion primarily responsible for this in other cardiac cells is_________.

Ca2+ and Na+

All of the following structural changes found in the heart occur with the normal aging process, except

increased elasticity of large vessels.

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?

Nitroglycerin

All of the following characteristics of the sarcoplasmic reticulum in cardiac muscle cells are true except

it has enlarged terminal cisternae like skeletal muscle fibers.

A knowledge of heart location would NOT be important for which of the following?

Blood pressure readings

When comparing cardiac muscle cells and skeletal muscle cells,

action potentials are conducted from cell to cell only in cardiac muscle.

The right side of the heart receives blood from the body and pumps through the_________ circulation to the lungs.

pulmonary

A stab wound into the heart can result in cardiac tamponade. This means that

the heart is compressed by blood in the pericardial sac.

An increase in extracellular Ca²⁺ generally increases

the force of contraction.