A&P 2, Unit 2, Exam

During a cardiac cycle, how many of the four chambers contract at any one time?

2

Which valve prevents the backflow of blood into the left ventricle when the ventricles relax?

Aortic semilunar valve

Parasympathetic innervation of the heart occurs via

CN X

Which action leads to the closure of the right atrioventricular valve?

Contraction of the right ventricle

Which vein drains the posterior aspect of the ventricles of the heart?

Middle cardiac vein

What part of the cardiac conduction system is located in the posterior wall of the right atrium, adjacent to the entrance of the superior vena cava?

SA node

The great cardiac vein runs alongside the

anterior interventricular artery.

The inferior, conical end of the heart is called the _______________.

apex

Cardiac output is the amount of blood that is pumped

by both ventricles in one minute.

What is the sequence of events in the transmission of an impulse through the heart muscle?

c, d, a, b, f, g, e

When blood is flowing out of the left ventricle, the bicuspid valve is __________ and the aortic semilunar

closed; open

During the plateau phase of a cardiac muscle cell's action potential, the membrane stays

depolarized as potassium exits and calcium enters.

The pericardium consists of a tough, fibrous connective tissue outer layer called the __________ pericardium.

fibrous

The function of the coronary sinus is to

guide the inferior vena cava into the right atrium.

Cardiac output equals the

heart rate multiplied by stroke volume.

The posterior interventricular sulcus

is a groove between the ventricles on the back of the heart.

The middle layer of the heart wall that is made of cardiac muscle tissue is the ________________.

myocardium

The layer of the heart wall composed of cardiac muscle tissue is the

myocardium.

The heart valves

permit the passage of blood in one direction.

Which of the cardiovascular system's circuits has deoxygenated blood in its arteries?

Pulmonary circuit

The heartbeat is initiated by the cells of the _______________ node.

SA

The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung. The pulmonary trunk is a(n)

artery

The force per unit area that blood places on the inside wall of a blood vessel

is called the blood pressure.

Blood moves into and then out of a heart chamber because

it moves along its pressure gradient, and that gradient depends on contraction and relaxation during the cardiac cycle.

The right border of the heart is supplied by the

right marginal artery.

Deep to the interventricular sulci is the thick muscular wall that divides the left and right ventricles, known as the interventricular ________.

sulci

The papillary muscles attach to the cusps of the atrioventricular valves by means of the

tendinous cords.

Unidirectional flow in the heart is ensured because the heart contains __________ that prevent backflow.

valves

The inferior chambers of the heart are called ________________.

ventricles

The pericardial cavity is between the

visceral and parietal layers of the serous pericardium.