Exam #1 mock questions Flashcards
Which of the following is the innermost layer of the heart? A. Visceral layer B. Endocardium C. Exocardium D. Epicardium
Endocardium
Which layer of the heart wall contracts and is composed primarily of cardiac muscle tissue? A. Epicardium B. Exocardium C. Myocardium D. Endocardium
Myocardium
Which of these vessels returns blood to the left atrium of the heart? A. Superior vena cava B. Pulmonary arteries C. Pulmonary trunk D. Pulmonary veins
Pulmonary veins
The right atrioventricular valve prevents back flow of blood from the right ventricle into the A. Pulmonary trunk B. Superior vena cava C. Left ventricle D. right atrium
D. Right atrium
Which heart chamber receives oxygenated blood from the lungs? A. left atrium B. left ventricle C. Right atrium D. Right ventricle
Left atrium
What is the function of the coronary circulation?
A. Provide a blood supply to the systemic circulation
B. Provide a blood supply to the pulmonary circulation
C. Provide a blood supply to the heart
D. Provide a blood supply only to the lungs
Provide blood supple to the heart
Identify the right atrioventricular valve. A. Tricuspid B. Pulmonary C. Aortic semilunar valve D. Bicuspid valve
A. tricuspid
Which chamber of the heart has the highest probability of being the site of a myocardial infarction? A. left atrium B. right atrium C. Left ventricle D. right ventricle
Left ventricle
The heart is actually: A. one pump B. two pumps C. three pumps D. Four pumps
Two pumps
Which chamber receives blood from the superior and inferior vena cava? A. Left V B. Right A. C. Left A. D. Right V
Right atrium
The presence of an incompetent tricuspid valve would have the direct effect of causing:
A. Reduced efficiency in the delivery of blood to the lungs
B. Red. efficiency in the del. of blood to the myocardium
C. Red. efficiency in the del. of blood from the heart to the lungs
D. Red. efficiency in the del. of blood from the head to the heart
Reduced efficiency of blood to the lungs
Into which chamber of the heart do the superior vena cava, inferior vena cava, and coronary sinus return deoxygenated blood?
Right atrium
Blood enters the left and right coronary arteries directly from which vessel or chamber? A. Aorta B. pulm. veins C. Pulm arteries D. Pulm. trunk
Aorta
Which of the following does NOT deliver de-oxygenated blood to the heart? A. Pulmonary veins B. superior vena cava C. Coronary sinus D. inferior vena cava
Pulmonary veins
Which characteristic is shared by both cardiac muscle and skeletal muscle cells? A. Triads B. striations C. Intercalated discs D. branched cells
Striations
What structures connect the individual heart muscle cells? A. intercalated discs B. trabaculae carneae C. Chordae tendineae D, Anastomoses
A. intercalated discs
If cardiac muscle is deprived of its normal blood supply, damage would primarily result from:
A. an excess of nutrients to feed into metabolic pathways
B. an inadequate supply of lactic acid
C. decrease delivery of oxygen
D. a decrease in the number of available nuclei for energy production
Decreased delivery of oxygen
What is false about ventricular filling? A. The AV valves are open B. The semilunar valves are closed C. The blood is flowing passively into the ventricles D. The semilunar valves are open
Semilunar valves are open (still in mid to late diastole, not systole)
The apex of the heart points toward: A. the right hip B. The left hip C. the right shoulder D. the left shoulder
Left hip
What is the main function of heart valves? A. separate left and right atria B. to pump blood throughout heart C. To prevent back flow of blood D. to separate atria and ventricles
Prevent backflow
In the isovolumetric contraction phase: A. only the semilunar valves are open B. only the AV valves are open C. only the AV valves are closed D. All the valves are closed
All valves are closed
When the atria contract, which of the following is true? A. The SL valves are open B. the atria are in diastole C. the AV valves are closed D. The ventricles are in diastole
Ventricles are in diastole (relaxation)
The heart receives: A. 1/4th of body blood supply B. 1/5 C. 1/10 D. 1/20
1/20
What is false about pacemaker cells? A. They are responsible for depolarization B. They are responsible for contraction C. They need nervous system stimulation D. A and B E. A and C
C. They need nervous system stimulation
Release of Ca++ from the SR is triggered by:
A. Depolarization wave
B. influx of K+ from the extracellular fluid
C. influx of Ca++ from the extracellular fluid
D. an influx of Na+ from extracellular fluid
Influx of ca++ from extracellular fluid
The three types of formed elements are:
A. leukocyres, platelets and erythrocytes
B. Leukocyres, plasma proteins and platelets
C. Erythrocytes, leukocytes, and plasma
A
The two most abundant components of whole blood, in order of most abundant and second abundant, are: A. Plasma, erythrocytes B. leukocytes, RBCS C. RBCS and platelets D. Plasma and WBCS
Plasma and Erythrocytes (leukocytes and platelets only make up <1% of whole blood)