Biol 203 Exam 3
BIOL 203 EXAM 3 NEWEST 2025 COMPLETE 100 QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS)|ALREADY GRADED A+
What effect did applying atropine prior to acetylcholine have on the rate and force of
contraction of the frog heart? - ANSWER-Atropine blocked the acetylcholine from decreasing
the heart rate, so no change in heart rate or force of contraction was seen when acetylcholine
was applied.
Did the hands and feet respond simultaneously to the stimuli? If not, how were they different? -
ANSWER-They were not simultaneous. The hands responded before the feet.
Sympathetic nerve fibers are not associated with situations involving __________. - ANSWER-
Digestion
If a cell has α1 adrenergic receptors, it is sensitive to __________. - ANSWER-Norepinephrine
Which one of the following is made up of primarily adrenergic fibers? - ANSWER-Postganglionic
neurons of the sympathetic division
Some antidepressant drugs act by inhibiting monoamine oxidase (MAO). What is the function of
this enzyme? - ANSWER-It breaks down monoamines.
Even though all action potentials are the same, the brain can differentiate a variety of stimuli by
source and intensity. The mechanism by which the nervous system converts these action
potentials into meaningful information is called neural __________. - ANSWER-Coding
What is the opposite of presynaptic inhibition? - ANSWER-Facilitation
1|Page
, Biol 203 Exam 3
Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle? - ANSWER-
Acetylcholine
The binding of __________ to a nicotinic receptor of a muscle fiber will __________ it. -
ANSWER-Acetylcholine; excite
Damage to the __________ may affect near vision accommodation. - ANSWER-Oculomotor
nerve (CN III)
Atropine is sometimes used to dilate the pupil for an eye examination. Which receptor would
atropine block? - ANSWER-Muscarinic receptor
Muscarinic receptors bind __________. - ANSWER-Acetylcholine
Autonomic nervous system fibers are involved in all of the following except __________. -
ANSWER-Maintaining tonicity of the muscles of the neck
Which of these does not contribute to the cessation of the signal in a synaptic transmission? -
ANSWER-Synaptic vesicles secrete neurotransmitters by exocytosis.
T or F: The latency for a response for sweating in the palms of the hands and soles of the feet is
longer in for the soles of the feet due to a longer path the impulse must travel. - ANSWER-True
Which of the following is not a reason that somatic reflexes act faster than visceral reflexes? -
ANSWER-The effector organs in the somatic reflex are closer to the spinal cord
The autonomic nervous system controls all of the following except the __________. - ANSWER-
skeletal muscle in the rectus abdominis
2|Page
, Biol 203 Exam 3
Which of the following statements is true regarding parasympathetic tone? - ANSWER-It holds
the resting heart rate below its intrinsic rate
T or F: Nitric oxide (NO) acts as a neuromodulator by altering synaptic function. - ANSWER-True
A neuron that synapses in the adrenal medulla is a __________ neuron, and releases the
neurotransmitter __________. - ANSWER-Preganglionic; acetylcholine (ACh)
Which of the following is associated with the "fight-or-flight" reaction? - ANSWER-Reduced
urinary output
Drugs that are monoamine oxidase (MAO) inhibitors would most likely __________. - ANSWER-
Decrease the amount of NE destroyed and may be used as an antidepressant
Which of the following is true regarding the autonomic nervous system? - ANSWER-Its
denervation would cause hypersensitivity
Which of the following is more effective in producing bronchodilation? - ANSWER-
Norepinephrine
Which of these is an example of an EPSP in a typical neuron? - ANSWER-A voltage change from -
70mV to -69.5 mV
After a stroke, a patient complains about lack of sensitivity in her right hand. The stroke most
likely affected which part of the brain? - ANSWER-Postcentral gyrus in the left parietal lobe
A predominance of which waves in an electroencephalogram (EEG) might indicate that a person
is physically and mentally relaxed? - ANSWER-Alpha
3|Page
BIOL 203 EXAM 3 NEWEST 2025 COMPLETE 100 QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS)|ALREADY GRADED A+
What effect did applying atropine prior to acetylcholine have on the rate and force of
contraction of the frog heart? - ANSWER-Atropine blocked the acetylcholine from decreasing
the heart rate, so no change in heart rate or force of contraction was seen when acetylcholine
was applied.
Did the hands and feet respond simultaneously to the stimuli? If not, how were they different? -
ANSWER-They were not simultaneous. The hands responded before the feet.
Sympathetic nerve fibers are not associated with situations involving __________. - ANSWER-
Digestion
If a cell has α1 adrenergic receptors, it is sensitive to __________. - ANSWER-Norepinephrine
Which one of the following is made up of primarily adrenergic fibers? - ANSWER-Postganglionic
neurons of the sympathetic division
Some antidepressant drugs act by inhibiting monoamine oxidase (MAO). What is the function of
this enzyme? - ANSWER-It breaks down monoamines.
Even though all action potentials are the same, the brain can differentiate a variety of stimuli by
source and intensity. The mechanism by which the nervous system converts these action
potentials into meaningful information is called neural __________. - ANSWER-Coding
What is the opposite of presynaptic inhibition? - ANSWER-Facilitation
1|Page
, Biol 203 Exam 3
Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle? - ANSWER-
Acetylcholine
The binding of __________ to a nicotinic receptor of a muscle fiber will __________ it. -
ANSWER-Acetylcholine; excite
Damage to the __________ may affect near vision accommodation. - ANSWER-Oculomotor
nerve (CN III)
Atropine is sometimes used to dilate the pupil for an eye examination. Which receptor would
atropine block? - ANSWER-Muscarinic receptor
Muscarinic receptors bind __________. - ANSWER-Acetylcholine
Autonomic nervous system fibers are involved in all of the following except __________. -
ANSWER-Maintaining tonicity of the muscles of the neck
Which of these does not contribute to the cessation of the signal in a synaptic transmission? -
ANSWER-Synaptic vesicles secrete neurotransmitters by exocytosis.
T or F: The latency for a response for sweating in the palms of the hands and soles of the feet is
longer in for the soles of the feet due to a longer path the impulse must travel. - ANSWER-True
Which of the following is not a reason that somatic reflexes act faster than visceral reflexes? -
ANSWER-The effector organs in the somatic reflex are closer to the spinal cord
The autonomic nervous system controls all of the following except the __________. - ANSWER-
skeletal muscle in the rectus abdominis
2|Page
, Biol 203 Exam 3
Which of the following statements is true regarding parasympathetic tone? - ANSWER-It holds
the resting heart rate below its intrinsic rate
T or F: Nitric oxide (NO) acts as a neuromodulator by altering synaptic function. - ANSWER-True
A neuron that synapses in the adrenal medulla is a __________ neuron, and releases the
neurotransmitter __________. - ANSWER-Preganglionic; acetylcholine (ACh)
Which of the following is associated with the "fight-or-flight" reaction? - ANSWER-Reduced
urinary output
Drugs that are monoamine oxidase (MAO) inhibitors would most likely __________. - ANSWER-
Decrease the amount of NE destroyed and may be used as an antidepressant
Which of the following is true regarding the autonomic nervous system? - ANSWER-Its
denervation would cause hypersensitivity
Which of the following is more effective in producing bronchodilation? - ANSWER-
Norepinephrine
Which of these is an example of an EPSP in a typical neuron? - ANSWER-A voltage change from -
70mV to -69.5 mV
After a stroke, a patient complains about lack of sensitivity in her right hand. The stroke most
likely affected which part of the brain? - ANSWER-Postcentral gyrus in the left parietal lobe
A predominance of which waves in an electroencephalogram (EEG) might indicate that a person
is physically and mentally relaxed? - ANSWER-Alpha
3|Page
