Stretching a skeletal muscle can depolarize sensory afferents that project into the spinal cord and synapse directly on motoneurons that innervate that muscle. For the toolbar, press ALT F10 (PC) or ALT+FN+F1O (Mac) BIVS Paragraph 10pt E Y A Arial

Stretching a skeletal muscle can depolarize sensory afferents that project into the spinal cord and synapse directly on motoneurons that innervate that muscle. For the toolbar, press ALT F10 (PC) or ALT+FN+F1O (Mac) BIVS Paragraph 10pt E Y A Arial

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter38: The Musculoskeletal System

Section: Chapter Questions

Problem 22RQ: The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous...

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Stretching a skeletal muscle can depolarize sonsory afferents that project into the spinal cord and synapse directly on motoneurons that innervate that muscle.
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In your own words, describe the main events occurring between the arrivalof an action potential at a motor neuron end plate and contraction of thecorresponding muscle. Use 250 words or less.
Acetylcholine-gated cation channels at the neu-romuscular junction open in response to acetylcholinereleased by the nerve terminal and allow Na+ ions to enterthe muscle cell, which causes membrane depolarizationand ultimately leads to muscle contraction.A. Patch-clamp measurements show that young ratmuscles have cation channels that respond to acetylcho-line (Figure Q11–4). How many kinds of channel are there?How can you tell?B. For each kind of channel, calculate the number ofions that enter in one millisecond. (One ampere is a cur-rent of one coulomb per second; one pA equals 10–12ampere. An ion with a single charge such as Na+ carries acharge of 1.6 × 10–19 coulomb.)
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We've referred to alpha-motor neurons as the "decision making centre" for whether or not a muscle fibre contracts. Which of the following statements are true with regards to his concept? Select all that apply. O Alpha motor neurons receive input from many different sources, the balance of which determines whether or not the alpha-motor neuron fires an action potential O Alpha motor neurons are involved in conscious decision making in our central nervous system for planning and executing movements O When an action potential is initiated in an alpha-motor neuron, we are guaranteed an action potential in the muscle fibre, and hence contraction of that fibre. This means the muscle itself does not determine whether or not it contracts O Alpha motor neurons report information on where we are in space (proprioception) back to the central nervous system
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The condition hyponatremia (hy′-poh-nah-TREE-mee-ah) is characterized by low levels of sodium ions in the blood and extracellular fluid. What do you think would happen to the action potential in the sarcolemma if there were insufficient sodium ions in the extracellular fluid? (Hint: Think about what will happen to the normal gradient of sodium ions in hyponatremia.)
Nernst (equilibrium) Potential (mV) - 6.lol 0.07 0.125 D.094 lon Intracellular Extracellular Concentration (mM) Concentration (mM) K* 155 4 Nat 12 145 Ca** 104 1.5 4 120 D) If during the generation of an action potential in the skeletal muscle cell the membrane potential approaches +65 mV, membrane permeability for which ion likely plays a major role in membrane depolarization? Explain your choice.
*When dynamic y-motor neurons are activated at the same time as a-motor neurons to muscle, [A] prompt inhibition of discharge in spindle la afferents takes place. [B] clonus is likely to occur. [C] the muscle will not contract. [D] the number of impulses in spindle la afferents is smaller than when a discharge alone is increased. [E] the number of impulses in spindle la afferents is greater than when a discharge alone is increased.
The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse The activity of helps to remove this neurotransmitter. myosin action potential tropomyosin acetylcholinesterase
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