CH. 18 Study questions

aortic semilunar valve

prevents backflow of blood into the left ventricle

Freshly oxygenated blood is delivered to the __________, and then it passes into the __________ to be pumped to the body tissues (systemic circuit).

left atrium; left ventricle

Which of the following would lead to a decrease in heart rate?

parasympathetic stimulation

cardiac cycle

the events associated with blood flow through the heart during one complete heartbeat

The second heart sound (the "dup" of "lub-dup") is caused by the __________.

closure of the semilunar valves

pulmonary semilunar valve

prevents backflow of blood into the right ventricle

posterior interventricular artery

. runs to the apex of the heart

The most muscular chamber of the heart is the __________.

left ventricle

The superior chambers of the heart are called the __________.

atria

The QRS complex shows

ventricular depolarization

the T wave is generated by

ventricular repolarization

diastole

Relax

In the fetus, blood from the left and right sides of the heart normally mix.

True

Which of the following is a difference between cardiac muscle and skeletal muscle?

Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic.

systole

contraction

anterior interventricular artery

supplies blood to the interventricular septum and anterior walls of both ventricles

The lining of the heart chambers is called the __________.

Endocardium

Which of the following is NOT a role of the fibrous pericardium?

It facilitates heart contraction. (The fibrous pericardium is the superficial part of the pericardium that encloses the heart. It protects the heart, prevents the heart from overfilling with blood, and anchors the heart to surrounding structures.)

The P wave of an electrocardiogram represents __________.

atrial depolarization

Into which chamber of the heart do the pulmonary veins deliver blood?

left atrium

The left side of the heart pumps blood to the body tissues and is known as the systemic circuit pump. Freshly oxygenated blood from the lungs is returned to the left atrium. From the left atrium, the blood flows into the ___________________________________________.

left ventricle. The left ventricle then pumps the blood to the aorta, which distributes it to the body tissues (systemic circuit).

The role of the atrioventricular node (AV node) is to __________.

slow down impulses so that the atria can contract to fill the adjacent ventricles with blood

right marginal artery

supplies blood to the lateral right side of the myocardium

circumflex artery

supplies blood to the left atrium and posterior walls of the left ventricle

cardiac output

the amount of blood pumped by each ventricle in one minute

stroke volume

the amount of blood pumped by one ventricle with each heartbeat

mitral (bicuspid) valve

valve between the left atrium and left ventricle

tricuspid valve

valve between the right atrium and right ventricle