Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 35, Problem 9TY
Summary Introduction
Introduction:
A muscle fiber is the muscle cell produced from the fusion of developmental myoblasts. A muscle fiber is a cylindrical shape having more than one nucleus.
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A motor unit associated with the stimulation of skeletal muscle is designated as a 1:8 motor unit. Which of the following statements is correct?
The motor unit consists of one somatic neuron and 8 myofibers (muscle fibers)
Each of the myofibers in the motor unit is innervated by more than one neuron
It is part of the autonomic nervous system
The neuron in the motor unit is an afferent neuron
From the following choices, choose the THREE, that would result in prevention of muscle contraction (in other words, which three descriptive changes below would result in flaccid paralysis of a muscle).
exocytosis of acetylcholine is constant, even without action potential
injection of botulinum toxin
calcium cannot be pumped back into the terminal cisternae
acetylcholine receptor remains open to sodium
active sites on actin a permanently exposed
dramatically increase the activity of acetylcholinesterase
calcium cannot bind troponin
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Chapter 35 Solutions
Principles of Biology
Ch. 35.1 - Prob. 1CCCh. 35.1 - Prob. 1TYKCh. 35.1 - Prob. 2TYKCh. 35.2 - Prob. 1CCCh. 35.2 - Rigor mortis is the condition that occurs shortly...Ch. 35.2 - Prob. 1BCCh. 35.2 - Prob. 3CCCh. 35.2 - Prob. 2BCCh. 35.2 - Prob. 1TYKCh. 35.2 - Prob. 2TYK
Ch. 35.3 - Prob. 1TYKCh. 35.4 - Prob. 1TYKCh. 35.4 - Prob. 2TYKCh. 35 - Prob. 1TYCh. 35 - Which, if any, of the following is not a function...Ch. 35 - Prob. 3TYCh. 35 - Prob. 4TYCh. 35 - Prob. 5TYCh. 35 - During cross-bridge cycling, binds to _________,....Ch. 35 - Prob. 7TYCh. 35 - Prob. 8TYCh. 35 - Prob. 9TYCh. 35 - Prob. 10TYCh. 35 - Prob. 1CCQCh. 35 - Prob. 2CCQCh. 35 - Prob. 3CCQCh. 35 - Discuss the structure and function of the two...Ch. 35 - Prob. 2CBQ
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- A _______________ is a drug that causes temporary paralysis by blocking the transmis- sion of nerve stimuli to the muscles. neuromuscular blocker skeletal muscle relaxantarrow_forwardIn smooth muscle cells, acetylcholine stimulates activation of the enzyme ________, which cleaves ________ to form the second messengers ________ and ________.arrow_forwardThe relaxation of skeletal muscle relies on the activity of the _ which decreases cytoplasmic calcium ion concentration. acetylcholine receptor Ca2+ -ATPase pump ryanodine receptor Na*/K* ATPase pumparrow_forward
- hen an action potential arrives at the nerve terminal of a neuromuscular junction, which of the following statements best describes the events that occur? Depolarisation of the nerve terminal causes the release of ACh which activates nicotinic receptors on the skeletal muscle membrane to cause Ca2+ entry and muscle contraction. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which activates voltage-gated Na+ channels at the end-plate. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which binds to muscarinic receptors at the end plate. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores…arrow_forwardThe nerve cells that stimulate muscle cells are: Group of answer choices- Somatic sensory neurons Autonomic motor neurons Interneuron Parasympathetic sensory neurons Somatic motor neuronsarrow_forwardThe region where a motor nerve fiber meets a skeletal muscle fiber is called a/an _____.arrow_forward
- All the following are necessary for a skeletal muscle cell to full relax, except one. Which answer choice is not necessary for a skeletal muscle cell to fully relax? Calcium pumped back into the SR Reuptake of ACh at the neuromuscular junction opening of nicotinic receptors Myosin heads release actin of filamentarrow_forwardMuscle spindle structures consist of: Extrafusal muscle fibers and gamma motor neurons Extrafusal muscle fibers and alpha motor neurons Golgi tendon organs and gamma motor neurons Intrafusal muscle fibers and gamma motor neuronsarrow_forwardLawrence Cherono from Kenya won the 2011 Boston Marathon. He probably has a predominance of in the muscle of his legs. fast twitch fibers fat intermediate twitch fibers slow twitch fibersarrow_forward
- Skeletal muscle cells have the ability to do all of the following EXCEPT _____. activating other muscle cells to contract producing force while shortening responding to chemicals released by nerve cells rebounding to their former length after being stretchedarrow_forwardHumming birds and rattlesnakes can contract and relax skeletal muscle very quickly, i.e. in 10-20 milliseconds. Which of the following steps must they have shortened to speed up contractions? more brief neuronal action potentials more brief skeletal muscle attion potentials shorter duration of calcium in the cytosol all of the abovearrow_forwardWhich of the following does not occur during the excitation contraction coupling of skeletal muscle? Opening of ryanodine receptor calcium channels Calcium binding to troponin Tropomyosin shifting away from myosin binding sites on the actin An end plate potentialarrow_forward
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