A research lab developed a drug and they hired you to help figure out what type of receptor is being affected. First you added the drug to a sample of smooth muscle that was attached to a myogram in a saline bath and found that the drug decreased smooth muscle contractions. Based on this result, you hypothesized that the drug could be (select all that apply) | An antagonist for nicotinic receptors | An antagonist for muscarinic receptors An agonist for nicotinic receptors O An agonist for muscarinic receptors

A research lab developed a drug and they hired you to help figure out what type of receptor is being affected. First you added the drug to a sample of smooth muscle that was attached to a myogram in a saline bath and found that the drug decreased smooth muscle contractions. Based on this result, you hypothesized that the drug could be (select all that apply) | An antagonist for nicotinic receptors | An antagonist for muscarinic receptors An agonist for nicotinic receptors O An agonist for muscarinic receptors

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter7: The Peripheral Nervous System: Efferent Division

Section: Chapter Questions

Problem 4RE

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Similar questions

Why is it important to remove acetylcholine from its binding to acetylcholine receptors once the neural stimulus ends? What can be the possible consequence of the non-removal of acetylcholine to the skeletal muscle fiber?
Explain why muscle tone is first decreased and then increased when descending motor tracts aredamaged. How is muscle tone maintained?
Explain why the ratio of motor neurons to muscle fibers isgreater in muscles that control eye movement than in posturalmuscles of the leg.
In the stretch reflex,a. Golgi tendon organs activate contraction in extrafusal muscle fibersconnected to that tendon.b. lengthening of muscle-spindle receptors in a muscle leads tocontraction in an antagonist muscle.c. action potentials from muscle-spindle receptors in a muscle formmonosynaptic excitatory synapses on motor neurons to extrafusal fiberswithin the same muscles.d. slackening of intrafusal fibers within a muscle activates gamma motorneurons that form excitatory synapses with extrafusal fibers within thatsame muscle.e. afferent neurons to the sensorimotor cortex stimulate the agonist muscle to contract and the antagonist muscle to be inhibited
A muscle cell contains acetylcholine receptors that act as ligand-gated cation channels,and it also contains voltage-gated Na+ channels of the type found in neurons. Intheory, could a muscle cell get away with having only acetylcholine-gated cationchannels, which would serve the dual purpose of receiving neurotransmitter signalsand propagating action potentials? Why or why not?
Discharge from muscle spindles could be increased by all the following, except :-a- increased α-motor neuron dischargeb- increased γ-motor neuron dischargec- stretch of the intrafusal muscle fibersd- stretch of the extrafusal muscle fibers
One tretment for myasthenia gravis is a medication that blocks the activity of acetylcholinesterase. Why is this a successful treatment?
Which role do gamma (γ) motor neurons play in the function of a muscle spindle? Select one: a. They improve the accuracy of the reported sensory information by innervating intrafusal fibers b. They enhance the force of muscle contraction by innervating intrafusal fibers c. They coordinate the contraction of extrafusal and intrafusal fibers d. They improve the accuracy of the reported sensory information by innervating extrafusal fibers e. They enhance the force of muscle contraction by innervating extrafusal fibers
The highly localized nature of stretch reflex is due to :-a- the limited number of interneurons in the reflex pathwayb- all the central ends of afferents from spindles of the stretched muscle terminate on the α -motor neurons of the musclec- the α -motor neurons of the stretched muscle receive most of the central terminals of afferents coming from spindles of the muscled- activation of inhibitory interneurons which inhibit the motor neurons ofthe surrounding muscles
If implanted electrodes were used to stimulate action potentials in gamma motor neurons to flexors of the left arm, which would be the most likely result?a. inhibition of the flexors of the left armb. a decrease in action potentials from muscle-spindle receptors in the left armc. a decrease in action potentials from Golgi tendon organs in the left armd. an increase in action potentials along alpha motor neurons to flexors inthe left arme. contraction of flexor muscles in the right arm
What ion is needed to release neurotransmitters from thesynaptic vesicle? What neurotransmitter is released toskeletal muscle fibers?
Since neurotransmittersare not consumed in thesynaptic process, what are themechanisms to reduce theirconcentrations in the synapticcleft after they have beenused?