An incompetent aortic semilunar valve would allow blood to backflow from the ________.
A) right ventricle to the right atrium
B) left ventricle to the left atrium
C) aorta to the left ventricle
D) aorta to the left atrium
E) pulmonary trunk to the left ventricle
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Question 2) Which of the following is the correct sequence in a typical reflex arc?
A) effector, sensory neuron, integration center, motor neuron, receptor
B) receptor, sensory neuron, integration center, motor neuron, effector
C) effector, motor neuron, integration center, sensory neuron, receptor
D) receptor, motor neuron, integration center, sensory neuron, effector
E) receptor, sensory neuron, motor neuron, integration center, effector
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Question 3) What structure divides the left ventricle from the right ventricle?
A) interventricular septum
B) interatrial septum
C) bicuspid valve
D) tricuspid valve
E) chordae tendineae
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Question 4) Which of the following terms indicates a nerve impulse has been initiated and is being transmitted?
A) graded potential
B) action potential
C) repolarization
D) local depolarization
E) depolarization
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Question 5) Pulmonary arteries transport ________.
A) oxygenated blood to the lungs
B) blood rich in carbon dioxide to the lungs
C) oxygenated blood to the heart
D) oxygenated blood directly to the aorta
E) blood rich in carbon dioxide to the right atrium of the heart
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Question 6) The gap between two communicating neurons is termed ________.
A) synaptic cleft
B) cell body
C) effector
D) Schwann cell
E) node of Ranvier
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Question 7) Which vessels return oxygenated blood to the left atrium of the heart?
A) pulmonary arteries
B) superior vena cava
C) aorta
D) pulmonary veins
E) inferior vena cava
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Question 8) Which ion causes neurotransmitter vesicles to fuse with the axon's membrane during the conduction of a nerve impulse from one neuron to the next?
A) chlorine
B) sodium
C) potassium
D) calcium
E) magnesium
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Question 9) Pulmonary circulation involves blood flow to and from the heart and the ________.
A) body
B) digestive organs
C) skin
D) lungs
E) brain
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Question 10) Which one of the following is the correct sequence of events that correlates to the sequence of events of a nerve impulse? 1. the membrane becomes depolarized 2. sodium channels open and sodium ions diffuse inward 3. the membrane becomes repolarized 4. potassium channels open and potassium ions diffuse outward
A) 3, 2, 4, 1
B) 2, 1, 4, 3
C) 2, 1, 3, 4
D) 1, 2, 4, 3
E) 4, 1, 3, 2
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