Here is the question: Question Intro to Neuroscience Question: Students are celebrating the end of the year and have gotten together for a few ice-old Pepsi’s. Sarvesh holds out his mug for a refill and when Nicole starts to pour soda in, the mug slips down slightly but Sarvesh quickly recovers to prevent his mug from spilling. Which of the following does NOT occur in this reflex circuit? Group of answer choices a) The added load of the soda stretches the intrafusal muscle fibers of the bicep b) Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons c) The rate of action potential firing increases in the muscle spindle fiber d) Excitation of motor neurons innervating the bicep muscle e)All of the above *do* occur Possible explanation/reasoning: a) The added load of the soda stretches the intrafusal muscle fibers of the bicep Yes, the event described in a) is likely to occur. When an added load (in this case, the soda being poured) is applied to a muscle (in this case, the bicep), it can cause stretching of the muscle. Within the muscle are specialized structures called muscle spindles, which contain intrafusal muscle fibers. These fibers are sensitive to stretch. So, when the bicep muscle is stretched due to the added load, the intrafusal muscle fibers within the muscle spindles of the bicep would also be stretched. This stretching then leads to the activation of sensory neurons associated with the muscle spindles, initiating the reflex circuit. b) Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons. This is accurate. When the intrafusal muscle fibers are stretched, they activate sensory neurons. These sensory neurons then synapse onto α motor neurons, which directly innervate the main muscle fibers (extrafusal fibers) causing them to contract. They also synapse onto interneurons which can provide inhibitory signals to motor neurons of antagonist muscles (for example, the triceps), ensuring coordinated movement. Is my reasoning correct?

Here is the question: Question Intro to Neuroscience Question: Students are celebrating the end of the year and have gotten together for a few ice-old Pepsi’s. Sarvesh holds out his mug for a refill and when Nicole starts to pour soda in, the mug slips down slightly but Sarvesh quickly recovers to prevent his mug from spilling. Which of the following does NOT occur in this reflex circuit? Group of answer choices a) The added load of the soda stretches the intrafusal muscle fibers of the bicep b) Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons c) The rate of action potential firing increases in the muscle spindle fiber d) Excitation of motor neurons innervating the bicep muscle e)All of the above do occur Possible explanation/reasoning: a) The added load of the soda stretches the intrafusal muscle fibers of the bicep Yes, the event described in a) is likely to occur. When an added load (in this case, the soda being poured) is applied to a muscle (in this case, the bicep), it can cause stretching of the muscle. Within the muscle are specialized structures called muscle spindles, which contain intrafusal muscle fibers. These fibers are sensitive to stretch. So, when the bicep muscle is stretched due to the added load, the intrafusal muscle fibers within the muscle spindles of the bicep would also be stretched. This stretching then leads to the activation of sensory neurons associated with the muscle spindles, initiating the reflex circuit. b) Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons. This is accurate. When the intrafusal muscle fibers are stretched, they activate sensory neurons. These sensory neurons then synapse onto α motor neurons, which directly innervate the main muscle fibers (extrafusal fibers) causing them to contract. They also synapse onto interneurons which can provide inhibitory signals to motor neurons of antagonist muscles (for example, the triceps), ensuring coordinated movement. Is my reasoning correct?

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

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter5: The Central Nervous System

Section: Chapter Questions

Problem 8RE

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Intro to Neuroscience Question: Students are celebrating the end of the year and have gotten together for a few ice-old Pepsi’s. Sarvesh holds out his mug for a refill and when Nicole starts to pour soda in, the mug slips down slightly but Sarvesh quickly recovers to prevent his mug from spilling. Which of the following does NOT occur in this reflex circuit? Group of answer choices a) The added load of the soda stretches the intrafusal muscle fibers of the bicep b) Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons c) The rate of action potential firing increases in the muscle spindle fiber d) Excitation of motor neurons innervating the bicep muscle e)All of the above *do* occur

Possible explanation/reasoning:

a) The added load of the soda stretches the intrafusal muscle fibers of the bicep

Yes, the event described in a) is likely to occur. When an added load (in this case, the soda being poured) is applied to a muscle (in this case, the bicep), it can cause stretching of the muscle. Within the muscle are specialized structures called muscle spindles, which contain intrafusal muscle fibers. These fibers are sensitive to stretch. So, when the bicep muscle is stretched due to the added load, the intrafusal muscle fibers within the muscle spindles of the bicep would also be stretched. This stretching then leads to the activation of sensory neurons associated with the muscle spindles, initiating the reflex circuit.

b) Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons. This is accurate. When the intrafusal muscle fibers are stretched, they activate sensory neurons. These sensory neurons then synapse onto α motor neurons, which directly innervate the main muscle fibers (extrafusal fibers) causing them to contract. They also synapse onto interneurons which can provide inhibitory signals to motor neurons of antagonist muscles (for example, the triceps), ensuring coordinated movement.

Is my reasoning correct?

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