A&P 2 Chapter 18 The Heart

A) Ischemia B) Ectopic focus C) Quiescent period D) Infarction E) Fibrillation 33) Heart muscle is deprived of oxygen. 34) Death of heart muscle cells. 35) A condition of rapid and irregular or out-of-phase contraction of heart muscle cells. 36) An abnormal pacemaker. 37) Total heart relaxation.

33. A- Ischemia 34. D- Infarction 35. E- Fibrillation 36. B- Ectopic focus 37. C- Quiescent period

A) Purkinje fibers B) AV bundle C) SA node D) AV node 18) The pacemaker of the heart. 19) Found in the interventricular septum. 20) Network found in the ventricular myocardium. 21) The point in the conduction system of the heart where the impulse is temporarily delayed.

18. (C) SA node 19. (B) AV bundle 20. (A) purkinje fibers 21. (D) AV node

Which vessel of the heart receives blood during right ventricular systole? A) venae cavae B) pulmonary trunk C) aorta D) pulmonary veins

B) pulmonary trunk

A) Epicardium B) Parietal layer C) Myocardium D) Endocardium 14) The inner lining of the heart 15) Heart muscle 16) Serous layer covering the heart muscle 17) The outermost layer of the serous pericardium

14- (D) Endocardium 15- ( C ) Myocardium 16- (A) Epicardium 17- (B) Parietal Layer

Select the correct statement about cardiac output. A) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction. B) Decreased venous return will result in increased end diastolic volume. C) If a semilunar valve were partially obstructed, the end systolic volume in the affected ventricle would be decreased. D) Stroke volume increases if end diastolic volume decreases.

A) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction.

Which of the events below does not occur when the semilunar valves are open? A) Ventricles are in diastole. B) Blood enters pulmonary arteries and the aorta. C) AV valves are closed. D) Ventricles are in systole.

A) Ventricles are in diastole.

Hemorrhage with a large loss of blood causes ________. A) a lowering of blood pressure due to change in cardiac output B) a rise in blood pressure due to change in cardiac output C) no change in blood pressure but a slower heart rate D) no change in blood pressure but a change in respiration

A) a lowering of blood pressure due to change in cardiac output

Foramen ovale ________. A) connects the two atria in the fetal heart B) is a condition in which the heart valves do not completely close C) is a shallow depression in the interventricular septum D) is a connection between the pulmonary trunk and the aorta in the fetus

A) connects the two atria in the fetal heart

Isovolumetric contraction ________. A) refers to the short period during ventricular systole when the ventricles are completely closed chambers B) occurs while the AV valves are open C) occurs immediately after the aortic and pulmonary valves close D) occurs only in people with heart valve defects

A) refers to the short period during ventricular systole when the ventricles are completely closed chambers

During the period of ventricular filling ________. A) pressure in the heart is at its peak B) blood flows passively through the atria and the open AV valves into the ventricles C) the atria remain in diastole D) it is represented by the P wave on the ECG

B) blood flows passively through the atria and the open AV valves into the ventricles

Blood within the pulmonary veins returns to the ________. A) right atrium B) left atrium C) right ventricle D) left ventricle

B) left atrium

When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________. A) tracing out where the auricles connect B) noticing the thickness of the ventricle walls C) locating the apex D) finding the papillary muscles

B) noticing the thickness of the ventricle walls

The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it ________. A) pumps a greater volume of blood B) pumps blood against a greater resistance C) expands the thoracic cage D) sends blood through a smaller valve

B) pumps blood against a greater resistance

The tricuspid valve is closed ________. A) while the ventricle is in diastole B) when the ventricle is in systole C) while the atrium is contracting D) by the movement of blood from atrium to ventricle

B) when the ventricle is in systole

The source of blood carried to capillaries in the myocardium would be the ________. A) coronary sinus B) fossa ovalis C) coronary arteries D) coronary veins

C) coronary arteries

Small muscle masses attached to the chordae tendineae are the ________. A) trabeculae carneae B) pectinate muscles C) papillary muscles D) venae cavae

C) papillary muscles

The left ventricular wall of the heart is thicker than the right wall in order to ________. A) accommodate a greater volume of blood B) expand the thoracic cage during diastole C) pump blood with greater pressure D) pump blood through a smaller valve

C) pump blood with greater pressure

Damage to the ________ is referred to as heart block. A) SA node B) AV valves C) AV bundle D) AV node

D) AV node

Select the correct statement about the heart valves. A) The mitral valve separates the right atrium from the right ventricle. B) The tricuspid valve divides the left atrium from the left ventricle. C) Aortic and pulmonary valves control the flow of blood into the heart. D) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.

D) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.

The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ________. A) ischemia B) pericarditis C) myocardial infarct D) angina pectoris

D) angina pectoris

The P wave of a normal electrocardiogram indicates ________. A) ventricular repolarization B) ventricular depolarization C) atrial repolarization D) atrial depolarization

D) atrial depolarization

Which of these vessels receives blood during ventricular systole? A) aorta only B) pulmonary arteries only C) pulmonary veins only D) both the aorta and pulmonary trunk

D) both the aorta and pulmonary trunk

Norepinephrine acts on the heart by ________. A) decreasing heart contractility B) causing a decrease in stroke volume C) blocking the action of calcium D) causing threshold to be reached more quickly

D) causing threshold to be reached more quickly

Which of the following is not an age-related change affecting the heart? A) atherosclerosis B) decline in cardiac reserve C) fibrosis of cardiac muscle D) thinning of the valve flaps

D) thinning of the valve flaps