CAMP.BIO:CONC...MOD.MAST+PRINT>I<
10th Edition
ISBN: 9780136858287
Author: Taylor
Publisher: INTER PEAR
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Textbook Question
Chapter 30, Problem 3TYK
Arm muscles and leg muscles are arranged in antagonistic pairs. How does this affect their functioning?
a. It provides a backup if one of the muscles is injured.
b. One muscle of the pair pushes while the other pulls.
c. A single motor neuron can control both of them.
d. It allows the muscles to produce opposing movements.
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How does the nervous system grade the force of muscle contraction?
a. Only by recruiting additional motor units
b. Only by varying the firing rate of the motor neurons
Oc. By varying the firing rate of the motor neurons and by recruiting additional motor units
d. By using more motor neuron pools
Which statement CORRECTLY describes a motor unit?
O a.
A single muscle fibre plus all the motor neurons that innervate it.
O b. All the motor neurons supplying a single muscle
O c.
A pair of antagonistic muscles
O d. A single motor neuron plus all the muscle fibres it innervates
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
Chapter 30 Solutions
CAMP.BIO:CONC...MOD.MAST+PRINT>I<
Ch. 30 - Complete this concept map on animal movement.Ch. 30 - A humans internal organs are protected mainly by...Ch. 30 - Arm muscles and leg muscles are arranged in...Ch. 30 - Gravity would have the least effect on the...Ch. 30 - Prob. 5TYKCh. 30 - Prob. 6TYKCh. 30 - When a dog is running fast, its body position is...Ch. 30 - What is the role of calcium in muscle contraction?...Ch. 30 - Muscle A and muscle B have the same number of...Ch. 30 - Prob. 10TYK
Ch. 30 - Prob. 11TYKCh. 30 - Prob. 12TYKCh. 30 - Prob. 13TYKCh. 30 - Describe how you bend your arm, starting with...Ch. 30 - Prob. 15TYKCh. 30 - Drugs are often used to relax muscles during...Ch. 30 - An earthworms body consists of a number of...Ch. 30 - When a person dies, muscles become rigid and fixed...Ch. 30 - SCIENTIFIC THINKING Imagine you have a friend who...
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- Try to explain completelyarrow_forwardWhat might happen if skeletal muscle lacked tropomyosin? A. The striation pattern would disappear. B. Ca2+ levels in the muscle would decrease. C. Actin and myosin would not be able to form cross-bridges. D. Acetylcholine would not be released into the synaptic cleft. E. Myosin and actin would form cross-bridges whenever ATP is available.arrow_forwardWhat happens at a neuromuscular junction?a. An electrical impulse causes the release of a chemical.b. Acetylcholine is released by the muscle cell.c. Acetylcholinesterase is released from the nerve cell.d. A neurotransmitter is released.e. Acetylcholine fits into receptors on the muscle cell.arrow_forward
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- Which event listed above is the point at which myasthenia gravis interrupts the process? A. Nerve impulse reaches the axon terminal B. Synaptic vesicles release acetylcholine into the synaptic cleft C. Acetylcholine diffuses across the synaptic cleft D. Acetylcholine binds to receptors at the motor end platearrow_forwardWhat is the first and most direct energy source for muscle contraction? a. glucose b. ATP c. creatine phosphate d. glycogenarrow_forwardWhich type of muscle has muscle cells that connect to one another at junctions called intercalated disks? A. Striated voluntary muscle B. Nonstriated involuntary muscle C. Nonstriated voluntary muscle D. Striated involuntary musclearrow_forward
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