IPHY3430 Unit 3 HW Qs Questions and
Correct Answers.
What happens to acetylcholine after it binds to an acetylcholine receptor?
a) it enters the postsynaptic cell & is inactivated
b) it is inactivated in the synaptic cleft
c) it is transported into neighboring glial cells & inactivated - Answer b
Organophosphate insecticides are acetylcholinesterase inhibitors. What symptoms might you
expect to observe in a patient with organophosphate poisoning due to any changes in
parasympathetic activity? Choose ALL that apply.
a) decreased heart rate (bradycardia)
b) dilated pupils
c) increased blood pressure
d) increased salivary secretion - Answer a & d
If you give an individual an antagonist of the muscarinic cholinergic receptor (mAChR), that
person would likely experience which of the following symptoms? Choose ALL that apply.
a) dilated pupils
b) decreased insulin secretion
c) increased salivation
d) slowed heart rate
e) slowed digestion - Answer a, b, & e
Which structure leads to activation of preganglionic neurons of the sympathetic nervous system
to activate a fight-or-flight response? - Answer hypothalamus
Bet blockers (beta-adrenergic antagonists) are used for a variety of medical conditions (e.g.
glaucoma, heart problems, anxiety). Chronic therapy with beta-blockers can lead to ______
(downregulation or upregulation) of beta-adrenergic receptor density. If a patient suddenly
stops taking beta-blockers, there can be side effects due to the abrupt withdrawal, such as ____
(bradycardia or tachycardia) because of the altered sensitivity of the target cells. - Answer
upregulation, tachycardia
If you wanted to develop a drug that would block vasodilation, but not vasoconstriction, you
would want to create an antagonist of which receptor type?
a) alpha adrenergic
b) beta adrenergic
, c) muscarinic cholinergic
d) nicotinic cholinergic - Answer b
You are pushing as hard as you can against a wall and suddenly your biceps muscles relax. What
is the sensory embedded in the biceps muscle which causes your biceps to relax? - Answer
Golgi tendon organ
Which of the following does the Golgi tendon reflex involve? Choose ALL that apply
a) a monosynaptic pathway
b) a polysynaptic pathway
c) an excitatory interneuron
d) an inhibitory interneuron
e) an excitatory synapse
f) an inhibitory synapse - Answer b, d, e, & f
You tap the tendon behind the knee that is attached to the hamstring muscle. In response to
this stimulus, which muscle would contract and which would relax? - Answer hamstring
contracts, quadriceps relaxes
Would you expect to see an excitatory or inhibitory graded potential in the input region of each
cell within the pathways of the stretch reflex, when the pathway is activated by stretch of the
agonist muscle?
a) sensory neuron in monosynaptic pathway
b) motor neuron in monosynaptic pathway
c) agonist muscle in monosynaptic pathway
d) sensory neuron in polysynaptic pathway
e) interneuron in polysynaptic pathway
f) motor neuron in polysynaptic pathway
g) antagonist muscle in polysynaptic pathway - Answer a) excitatory
b) excitatory
c) excitatory
d) excitatory
e) excitatory
f) inhibitory
g) excitatory
Correct Answers.
What happens to acetylcholine after it binds to an acetylcholine receptor?
a) it enters the postsynaptic cell & is inactivated
b) it is inactivated in the synaptic cleft
c) it is transported into neighboring glial cells & inactivated - Answer b
Organophosphate insecticides are acetylcholinesterase inhibitors. What symptoms might you
expect to observe in a patient with organophosphate poisoning due to any changes in
parasympathetic activity? Choose ALL that apply.
a) decreased heart rate (bradycardia)
b) dilated pupils
c) increased blood pressure
d) increased salivary secretion - Answer a & d
If you give an individual an antagonist of the muscarinic cholinergic receptor (mAChR), that
person would likely experience which of the following symptoms? Choose ALL that apply.
a) dilated pupils
b) decreased insulin secretion
c) increased salivation
d) slowed heart rate
e) slowed digestion - Answer a, b, & e
Which structure leads to activation of preganglionic neurons of the sympathetic nervous system
to activate a fight-or-flight response? - Answer hypothalamus
Bet blockers (beta-adrenergic antagonists) are used for a variety of medical conditions (e.g.
glaucoma, heart problems, anxiety). Chronic therapy with beta-blockers can lead to ______
(downregulation or upregulation) of beta-adrenergic receptor density. If a patient suddenly
stops taking beta-blockers, there can be side effects due to the abrupt withdrawal, such as ____
(bradycardia or tachycardia) because of the altered sensitivity of the target cells. - Answer
upregulation, tachycardia
If you wanted to develop a drug that would block vasodilation, but not vasoconstriction, you
would want to create an antagonist of which receptor type?
a) alpha adrenergic
b) beta adrenergic
, c) muscarinic cholinergic
d) nicotinic cholinergic - Answer b
You are pushing as hard as you can against a wall and suddenly your biceps muscles relax. What
is the sensory embedded in the biceps muscle which causes your biceps to relax? - Answer
Golgi tendon organ
Which of the following does the Golgi tendon reflex involve? Choose ALL that apply
a) a monosynaptic pathway
b) a polysynaptic pathway
c) an excitatory interneuron
d) an inhibitory interneuron
e) an excitatory synapse
f) an inhibitory synapse - Answer b, d, e, & f
You tap the tendon behind the knee that is attached to the hamstring muscle. In response to
this stimulus, which muscle would contract and which would relax? - Answer hamstring
contracts, quadriceps relaxes
Would you expect to see an excitatory or inhibitory graded potential in the input region of each
cell within the pathways of the stretch reflex, when the pathway is activated by stretch of the
agonist muscle?
a) sensory neuron in monosynaptic pathway
b) motor neuron in monosynaptic pathway
c) agonist muscle in monosynaptic pathway
d) sensory neuron in polysynaptic pathway
e) interneuron in polysynaptic pathway
f) motor neuron in polysynaptic pathway
g) antagonist muscle in polysynaptic pathway - Answer a) excitatory
b) excitatory
c) excitatory
d) excitatory
e) excitatory
f) inhibitory
g) excitatory
