A&P EXAM 2 pt1

concerning heart sounds, which of the following is correct?

the first heart sound occurs at the befinning of ventricular systole

the exchange of nutrients and gases between the blood and tissue cells is the primary function of _______

capillaries

sympathetic nerve fibers that innervate blood vessel walls are found primarily in the __________.

tunica media

what event(s) occur during the QRS complex of an electrocardiogram?

depolarization of the ventricles and repolarization of the atria

Which statement accurately describes a condition of the heart chambers during the cardiac cycle?

all four chambers of the heart are in diastole at the same time

When left atrial pressure exceeds left ventricular pressure

the bicuspid (mitral) valve opens

which layer of an artery wall contains endothelium?

tunica intimab

blood vessels enter and exit from the ________ of the heart

base

The epicardium

Covers the surface of the heart

From the heart to body tissues, which of the following sequences of vessels is correct?

Elastic artery, muscular artery, arteriole, capillary

The delivery of oxygen and nutrients to the tissues of the body is accomplished through the _______ Circulation

systematic

In the pulmonary circulation, the _______ carry blood to the lungs. 

pulmonary arteries

distributing arteries

contain a thick tunica media

As soon as left ventricular pressure exceeds the pressure in the aorta, the

Aortic semilunar valve opens

The blood vessels that are under the greatest pressure are the

Elastic arteries

Pressure in the right ventricle must exceed pressure in the ______ before the right ventricle can eject blood

pulmonary trunk

From the right ventricle, blood flows directly into the _______

pulmonary trunk

The period of time in which cardiac muscle cells are insensitive to further stimulation is called the

absolute refractory period

during the cardiac cycle,

the two atria relax while the two ventricles contract

Which of the following areas of the conduction system would produce spontaneous action potentials most frequently if the SA node were not functioning?

AV node

The first blood vessels that branch from the ascending aorta are the _______?

coronary arteries

Which of the following is NOT true about the heart

The apex of the heart is directed superiorly and to the left

Which vessels empty blood into the left atrium?

pulmonary veins

Of the types of damage resulting from a myocardial infarction, which is most likely to cause the greatest increase in the Q-T interval?

left bundle branch block

The P wave of an electrocardiogram indicates

atrial depolarization

Blood does not enter or leave the ventricles during the period called

isovolumetric contraction

Another name for the visceral pericardium is the ________.

epicardium

What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?

tachycardia

The right side of the heart receives blood from the body and pumps though the _______ Circulation to the lungs.

pulmonary

the heart

is a four-chambered muscular pump