anatomy chapter 22 quiz

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Of the four "normal" heart sounds, the initial "lubb" sound is heard when the

AV valves close.

The left atrium and left ventricle are part of which circuit of the cardiovascular system?

Systemic circuit

Which are differences between cardiac muscle tissue and skeletal muscle tissue?a: The sarcoplasmic reticulum in cardiac muscle is less extensive.b: The sarcoplasmic reticulum in cardiac muscle is more organized.c: Cardiac muscle has intercalated discs; skeletal muscle does not.d: Cardiac muscle has 1 or 2 nuclei per cell; skeletal muscle has multiple nuclei per cell.e: Cardiac muscle has more well-defined terminal cisternae.

a, c, d

It is the _____________ that permits the compression necessary to pump large volumes of blood out of the ventricles.

arrangement of cardiac muscle in the heart wall

In an EKG, the P wave is generated when the

atria depolarize.

The left and right coronary arteries travel within the

coronary sulcus.

The inferior chambers of the heart are the

ventricles.

The epicardium is another name for the

visceral layer of the serous pericardium.

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

2

Which correctly describes the heart's apex?

Projects slightly anteroinferiorly toward the left side of the body

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

Pulmonary circuit

Which carries oxygenated blood from the lungs to the heart?

Pulmonary veins

Which circuit of the cardiovascular system is responsible for sending blood to the kidneys, stomach, and pelvic regions?

Systemic circuit

Sympathetic innervation of the heart arises from the ________ segments of the spinal cord.

T1−T5

The foramen ovale is actually an opening in the

interatrial septum.

The cell-to-cell contacts of the cardiac muscle fibers are called

intercalated discs.

Development of the heart commences in the _______ week.

third

Which heart chambers pump deoxygenated blood?

Right atrium and right ventricle

The function of the coronary sinus is to

take blood from the coronary circulation to the right atrium.

During ventricular systole

the semilunar valves open and the AV valves close.

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

Aortic semilunar valve

Which action causes the closure of the right atrioventricular valve?

Contraction of the right ventricle

Which may predispose one to inadequate coronary blood flow?

Tachycardia

The beginning of the cardiac cycle is when the

atria contract.

In an EKG, the T wave denotes

repolarization of the ventricles.


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