Chapter 18 practice test

1.cardiac cycle 2.systole 3.diastole 4.stroke volume 5.cardiac output A. contraction B. relaxation C. the amount of blood pumped by each ventricle in one minute D. the volume of blood pumped by one ventricle with each heartbeat E. the events associated with blood flow through the heart during one complete heartbeat

1.cardiac cycle E. the events associated with blood flow through the heart during one complete heartbeat 2.systole A. contraction 3.diastole B. relaxation 4.stroke volume D. the volume of blood pumped by one ventricle with each heartbeat 5.cardiac output C. the amount of blood pumped by each ventricle in one minute

1.right marginal artery 2.posterior interventricular artery 3.anterior interventricular artery 4.circumflex artery A. supplies blood to the lateral right side of the myocardium B. runs to the apex of the heart C. supplies blood to the left atrium and posterior walls of the left ventricle D. supplies blood to the interventricular septum and anterior walls of both ventricles

1.right marginal artery A. supplies blood to the lateral right side of the myocardium 2.posterior interventricular artery B. runs to the apex of the heart 3.anterior interventricular artery D. supplies blood to the interventricular septum and anterior walls of both ventricles 4.circumflex artery C. supplies blood to the left atrium and posterior walls of the left ventricle

1.tricuspid valve 2.mitral (bicuspid) valve 3.aortic semilunar valve 4.pulmonary semilunar valve A. prevents backflow of blood into the right ventricle B. prevents backflow of blood into the left ventricle C. valve between the right atrium and right ventricle D. valve between the left atrium and left ventricle

1.tricuspid valve C. valve between the right atrium and right ventricle 2.mitral (bicuspid) valve D. valve between the left atrium and left ventricle 3.aortic semilunar valve B. prevents backflow of blood into the left ventricle 4.pulmonary semilunar valve A. prevents backflow of blood into the right ventricle

The lining of the heart chambers is called the __________. A.endocardium B.epicardium C.pericardium D.myocardium

A.endocardium

Which of the following would lead to a decrease in heart rate? A.parasympathetic stimulation C.sharply decreased blood volume D.exercise E.norepinephrine

A.parasympathetic stimulation

The role of the atrioventricular node (AV node) is to __________. A.slow down impulses so that the atria can contract to fill the adjacent ventricles with blood B.initiate ventricular depolarization C.initiate a sinus rhythm D.conduct impulses to the sinoatrial node (SA node)

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

Freshly oxygenated blood is delivered to the __________, and then it passes into the __________ to be pumped to the body tissues (systemic circuit). A.right ventricle; right atrium B.left atrium; left ventricle C.right atrium; right ventricle D.left ventricle; left atrium

B.left atrium; left ventricle

Which of the following is NOT a role of the fibrous pericardium? A.It protects the heart. B.It anchors the heart to surrounding structures. C.It facilitates heart contraction. D.It prevents the heart from overfilling with blood.

C.It facilitates heart contraction.

Which of the following are correctly paired? A.heart block: uncoordinated atrial and ventricular contraction B.arrhythmia: atrioventricular (AV) node failure C.ectopic focus: an abnormal pacemaker D.fibrillation: premature contraction

C.ectopic focus: an abnormal pacemaker

Which of the following is a difference between cardiac muscle and skeletal muscle? A.Unlike skeletal muscle, cardiac muscle does not use a sliding filament mechanism for contraction. B.Unlike skeletal muscle cells, cardiac muscle cells do not rely on calcium ions for contraction. C.Unlike skeletal muscle, cardiac muscle is not striated. D.Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic.

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

The superior chambers of the heart are called the __________. A.coronary chambers B.ventricles C.cavae D.atria

D.atria

The P wave of an electrocardiogram represents __________. A.atrial repolarization B.ventricular depolarization C.ventricular repolarization D.atrial depolarization

D.atrial depolarization

Into which chamber of the heart do the pulmonary veins deliver blood? A.left ventricle B.right atrium C.right ventricle D.left atrium

D.left atrium

The most muscular chamber of the heart is the __________. A.right atrium B.right ventricle C.left atrium D.left ventricle

D.left ventricle

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

True

The second heart sound (the "dup" of "lub-dup") is caused by the __________. A.closure of the atrioventricular valves B.opening of the atrioventricular valves Cclosure of the semilunar valves Dopening of the semilunar valves

closure of the semilunar valves