Chapter 20; Heart Assignment
Most of the middle layer in the heart wall is composed of a. cardiac muscle cells b. chondrocytes c. epitheliocytes d. fibrocytes e. smooth muscle cells
a. cardiac muscle cells
The ________________ deliver(s) blood to the myocardium a. coronary arteries b. cardiac veins c. superior vena cava d. carotid arteries e. coronary sinus
a. coronary arteries
Identify the structure labeled "6" a. cusp of tricuspid valve b. pulmonary semilunar valve c. aortic semilunar valve d. bicuspid valve e. ligamentum arteriosum
a. cusp of tricuspid valve
The atrioventricular valves permit blood flow a. in one direction only b. in both directions c. in many directions d. in opposite directions on the right and left e. from a ventricle to an atrium
a. in one direction only
The coronary sulcus is a groove that a. marks the boarder between the atria and ventricles b. marks the boundary line between the right and left ventricles c. marks the boundary line between the right and left atria d. separates the atrioventricular valves from the atria e. separated the coronary arteries from the coronary veins
a. marks the boarder between the atria and ventricles
The right ventricle pumps blood to the a. right and left lungs b. left ventricle c. left atrium d. aorta e. right atrium
a. right and left lungs
Blood returning to the heart from the systemic circuit first enters the a. right atrium b. right ventricle c. left atrium d. left ventricle e. conus arteriosus
a. right atrium
The first heart sound ("lubb") is associated with a. atrial systole b. closing of the atrioventricular valves c. opening of the atrioventricular valves d. closing of the semilunar valves e. opening of the semilunar valves
b. closing of the atrioventricular valves
The circumflex branch and the anterior interventricular artery are branches of the a. right coronary artery b. left coronary artery c. interventricular artery d. coronary sinus e. aorta
b. left coronary artery
The pulmonary arteries carry blood to the a. heart b. lungs c. brain d. intestines e. liver
b. lungs
Identify the structure labeled "19" a. tricuspid valve b. pulmonary semilunar valve c. aortic semilunar valve d. bicuspid valve e. ligamentum arteriosum
b. pulmonary semilunar valve
The normal pacemaker of the heart is located in a. the purkinje fibers b. the sinoatrial node c. the atrioventricular node d. the wall of the left ventricle e. both the left and right ventricles
b. the sinoatrial node
The following is a list of vessels and structures that are associated with the heart. What is the correct order for the flow of blood entering from the systemic circulation? 1. right atrium 2. left atrium 3. right ventricle 4. left ventricle 5. venae cavae 6. aorta 7. pulmonary trunk 8. pulmonary veins a. 1, 2, 7, 8, 3, 4, 6, 5 b. 1, 7, 3, 8, 2, 4, 6, 5 c. 5, 1, 3, 7, 8, 2, 4, 6 d. 5, 3, 1, 7, 8, 4, 2, 6 e. 5, 1, 3, 8, 7, 2, 4, 6
c. 5, 1, 3, 7, 8, 2, 4, 6
The _____________ valve prevents backward flow into the left atrium a. semicaval b. semilunar c. bicuspid d. tricuspid e. pulmonic
c. bicuspid
The ___________ is the difference between the resting and maximal cardiac output a. end-systolic volume b. end-diastolic volume c. cardiac reserve d. stroke volume e. ejection fraction
c. cardiac reserve
The cusps (leaflets) of atrioventricular valves attach directly to a. papillary muscles b. trabeculae carneae c. chordae tendineae d. interatrial septa e. coronary sulci
c. chordae tendineae
The P wave of the electrocardiogram is a signal from a. the SA node b. depolarization of the AV node c. depolarization of the atria d. repolarization of the atria e. depolarization of the ventricles
c. depolarization of the atria
The visceral pericardium is the same as the a. mediastinum b. parietal pericardium c. epicardium d. myocardium e. endocardium
c. epicardium
Blood is supplied to the muscular wall of the left atrium by the a. brachiocephalic artery b. right coronary artery c. left coronary artery d. phrenic arteries e. pulmonary arteries
c. left coronary artery
In the middle of the thoracic cavity is a region occupied by the heart, great vessels, thymus, esophagus, and trachea called the a. pleural space b. pericardial space c. mediastinum d. cardiac notch e. ventral cavity
c. mediastinum
Heart rate is controlled by neurons of the cardiovascular center located in the a. pons b. thalamus c. medulla oblongata d. hypothalamus e. higher centers
c. medullar oblongata
Identify the structure(s) labeled "8" a. moderator band b. pectinate muscles c. papillary muscles d. trabeculae carneae e. chordae tendineae
c. papillary muscles
The volume of blood ejected from each ventricle during a contraction is called the a. end-diastolic volume b. end-systolic volume c. stroke volume d. cardiac output e. cardiac reserve
c. stroke volume
As a result of the long refractory period in the cardiac action potential, cardiac muscle cannot exhibit a. tonus b. treppe c. tetany d. recruitment e. fatigue
c. tetany
The following are structural components of the conducting system of the heart. 1. Purkinje fibers 2. AV bundle 3. AV node 4. SA node 5. bundle branches The sequence in which excitation would move through this system is a. 1, 4, 3, 2, 5 b. 3, 2, 4, 5, 1 c. 3, 5, 4, 2, 1 d. 4, 3, 2, 5, 1 e. 4, 2, 3, 5, 1
d. 4, 3, 2, 5, 1
Depolarization of the ventricles is represented on an electrocardiogram by the a. P wave b. T wave c. S wave d. QRS complex e. PR complex
d. QRS complex
End-systolic volume is defined as the a. amount of blood a ventricle ejects per cycle b. amount of blood which backflows into a ventricle c. amount of blood remaining in an atrium after atrial systole d. amount of blood remaining in a ventricle after contraction e. stroke volume multiplied by the heart rate
d. amount of blood remaining in a ventricle after contraction
The left ventricle pumps blood to the a. lungs b. right ventricle c. right atrium d. aorta e. pulmonary circuit
d. aorta
The earlike extension of the atrium is the a. ventricle b. coronary sinus c. coronary sulcus d. auricle e. atricle
d. auricle
If the force of ventricular contraction increases, what will happen to the end-systolic volume? a. increase b. fluctuate rapidly c. remain the same d. decrease e. reduced to zero
d. decrease
Identify the structure labeled "21" a. bicuspid valve b. pulmonary semilunar valve c. aortic semilunar valve d. ligamentum arteriosum e. tricuspid valve
d. ligamentum arteriosum
The pulmonary semilunar valve prevents backward flow into the a. aorta b. pulmonary trunk c. pulmonary veins d. right ventricle e. left atrium
d. right ventricle
The T wave on an ECG tracing represents a. atrial depolarization b. atrial repolarization c. ventricular depolarization d. ventricular repolarization e. ventricular contraction
d. ventricular repolarization
Intercalated discs serve to transfer _____________ from cell to cell a. ionic currents b. action potentials c. the force of contraction d. electrical signal e. all of the answers are correct
e. all of the answers are correct
The interventricular sulci and coronary sulcus a. contain fat b. contain arteries c. contain veins d. are grooves on the surface of the heart e. all of the answers are correct
e. all of the answers are correct
The right atrium receives blood from the a. coronary sinus b. superior vena cava c. inferior vena cava d. systemic circuit e. all of the answers are correct
e. all of the answers are correct
The bicuspid or mitral valve is located a. in the opening of the aorta b. in the opening of the pulmonary trunk c. where the venae cavae join the right atrium d. between the right atrium and right ventricle e. between the left atrium and left ventricle
e. between the left atrium and left ventricle
The function of an atrium is to a. collect blood b. pump blood to the lungs c. pump blood into the systemic circuit d. pump blood to the ventricle e. collect blood then pump it to the ventricle
e. collect blood then pump it to the ventricle
The foramen ovale in the fetal heart is located in the a. right atrium b. left atrium c. right ventricle d. left ventricle e. interatrial septum
e. interatrial septum
The right pulmonary veins carry _____________ blood to the ____________ a. deoxygenated; left atrium b. oxygenated; right lung c. deoxygenated; superior vena cava d. deoxygenated; right atrium e. oxygenated; left atrium
e. oxygenated; left atrium
