HUMAN BIOLOGY LAB 3, EXERCISE #3
QUESTIONS WITH COMPLETE
SOLUTIONS
Blood flowing in the vena cava will next enter the __________. - ANSWER-right
atrium
Blood returning to the heart from the pulmonary circuit first enters the __________. -
ANSWER-left atrium
The __________ valve prevents backward flow of blood into the left ventricle. -
ANSWER-aortic
The pulmonary veins carry __________ blood to the __________ atrium. -
ANSWER-oxygenated; left
Which of the labeled valves will open during ventricular systole to allow the flow of
blood to the lungs? - ANSWER-the semilunar valve labeled B
The first heart sound, "lubb," is caused by the ________. - ANSWER-closing of the
atrioventricular valves
Which of these statements concerning the cardiac cycle is FALSE?
-AV valves close before semilunar valves open.
-Aortic pressure is greater than pulmonary trunk pressure.
-Ventricular systole begins at the peak of atrial systole.
-Cardiac cycle begins with atrial systole. - ANSWER-Ventricular systole begins at the
peak of atrial systole.
The ________ side of the heart supplies blood to the systemic circuit, while the
________ side of the heart supplies blood to the pulmonary circuit. (Figure 20-1) -
ANSWER-left; right
Beginning with the right atrium, what is the order of the valves through which blood
will pass? (Figure 20-5) - ANSWER-tricuspid valve, pulmonary valve, mitral valve,
aortic valve
The structure that permits blood flow from the right atrium to the left atrium in the
fetal circulation is the - ANSWER-foramen ovale.
Blood leaves the right ventricle by passing through the - ANSWER-pulmonary valve
The atrioventricular valves permit blood flow - ANSWER-in one direction only.
Blood returning to the heart from the systemic circuit first enters the - ANSWER-right
atrium
QUESTIONS WITH COMPLETE
SOLUTIONS
Blood flowing in the vena cava will next enter the __________. - ANSWER-right
atrium
Blood returning to the heart from the pulmonary circuit first enters the __________. -
ANSWER-left atrium
The __________ valve prevents backward flow of blood into the left ventricle. -
ANSWER-aortic
The pulmonary veins carry __________ blood to the __________ atrium. -
ANSWER-oxygenated; left
Which of the labeled valves will open during ventricular systole to allow the flow of
blood to the lungs? - ANSWER-the semilunar valve labeled B
The first heart sound, "lubb," is caused by the ________. - ANSWER-closing of the
atrioventricular valves
Which of these statements concerning the cardiac cycle is FALSE?
-AV valves close before semilunar valves open.
-Aortic pressure is greater than pulmonary trunk pressure.
-Ventricular systole begins at the peak of atrial systole.
-Cardiac cycle begins with atrial systole. - ANSWER-Ventricular systole begins at the
peak of atrial systole.
The ________ side of the heart supplies blood to the systemic circuit, while the
________ side of the heart supplies blood to the pulmonary circuit. (Figure 20-1) -
ANSWER-left; right
Beginning with the right atrium, what is the order of the valves through which blood
will pass? (Figure 20-5) - ANSWER-tricuspid valve, pulmonary valve, mitral valve,
aortic valve
The structure that permits blood flow from the right atrium to the left atrium in the
fetal circulation is the - ANSWER-foramen ovale.
Blood leaves the right ventricle by passing through the - ANSWER-pulmonary valve
The atrioventricular valves permit blood flow - ANSWER-in one direction only.
Blood returning to the heart from the systemic circuit first enters the - ANSWER-right
atrium
