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 The added load of the soda stretches the intrafusal muscle fibers of the bicep Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons The rate of action potential firing increases in the muscle spindle fiber Excitation of motor neurons innervating the bicep muscle All of the above *do* occur. Is this the right answer? if we consider the reflex circuit: The added weight of the soda would cause a stretch in the muscle, which would activate the muscle spindles. The intrafusal muscle fibers within the muscle spindle detect this stretch. Sensory neurons from the muscle spindle would indeed synapse onto α motor neurons and interneurons. The stretch would lead to an increased rate of action potential firing in the muscle spindle fiber. This, in turn, would cause excitation of motor neurons innervating the bicep muscle, leading to a reflex contraction of the muscle to counteract the unexpected load. Given this, the correct answer is indeed: "All of the above do occur."
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 The added load of the soda stretches the intrafusal muscle fibers of the bicep Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons The rate of action potential firing increases in the muscle spindle fiber Excitation of motor neurons innervating the bicep muscle All of the above *do* occur. Is this the right answer? if we consider the reflex circuit: The added weight of the soda would cause a stretch in the muscle, which would activate the muscle spindles. The intrafusal muscle fibers within the muscle spindle detect this stretch. Sensory neurons from the muscle spindle would indeed synapse onto α motor neurons and interneurons. The stretch would lead to an increased rate of action potential firing in the muscle spindle fiber. This, in turn, would cause excitation of motor neurons innervating the bicep muscle, leading to a reflex contraction of the muscle to counteract the unexpected load. Given this, the correct answer is indeed: "All of the above do occur."
Chapter8: The Nervous System
Section: Chapter Questions
Problem E1CRE
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Intro to
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
The added load of the soda stretches the intrafusal muscle fibers of the bicep
Sensory neurons from the muscle spindle synapse onto α motor neurons and interneurons
The rate of action potential firing increases in the muscle spindle fiber
Excitation of motor neurons innervating the bicep muscle
All of the above *do* occur. Is this the right answer?
if we consider the reflex circuit:
- The added weight of the soda would cause a stretch in the muscle, which would activate the muscle spindles. The intrafusal muscle fibers within the muscle spindle detect this stretch.
- Sensory neurons from the muscle spindle would indeed synapse onto α motor neurons and interneurons.
- The stretch would lead to an increased rate of action potential firing in the muscle spindle fiber.
- This, in turn, would cause excitation of motor neurons innervating the bicep muscle, leading to a reflex contraction of the muscle to counteract the unexpected load.
Given this, the correct answer is indeed: "All of the above do occur."
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