Laboratory Manual for Human Anatomy & Physiology Main Version
4th Edition
ISBN: 9781260159110
Author: Terry Martin
Publisher: Mcgraw-hill Higher Education (us)
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Textbook Question
Chapter 20, Problem 4PL
The neuron and the muscle fibers it innervates is called the
a. neural impulse.
b. muscle fiber.
c. motor neuron.
d. motor unit.
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Students have asked these similar questions
The cross bridges of the sarcomere in skeletal muscle are made up of
A. myelin.
B. tropomyosin.
C. myosin.
D. actin.
E. myoglobulin.
F. troponin.
Which of the following correctly lists the structures that make up a motor unit?
a. motor neuron plus some of the muscle fibers it innervates
b. motor neuron plus all of the muscle fibers it innervates
c. motor neuron plus one of the muscle fibers it innervates
d. all of the above
e. none of the above
Skeletal muscle is also known as a. involuntary. b. voluntary. c. cardiac. d. smooth.
Chapter 20 Solutions
Laboratory Manual for Human Anatomy & Physiology Main Version
Ch. 20 - The outermost layer of connective tissue of a...Ch. 20 - The thick myofibril filament of a sarcomere is...Ch. 20 - The muscle primarily responsible for an action is...Ch. 20 - The neuron and the muscle fibers it innervates is...Ch. 20 - The functional contractile unit of a muscle fiber...Ch. 20 - Prob. 6PLCh. 20 - A synergistic muscle contraction assists the...Ch. 20 - The plasma membrane of a muscle fiber (cell) is...Ch. 20 - Match the terms in column A with the definitions...Ch. 20 - FIGURE 20.7 Label this transmission electron...
Ch. 20 - When stimulated to contract, the sarcomeres...Ch. 20 - Prob. 3.1ACh. 20 - The ____________ of a muscle is attached to a more...Ch. 20 - A muscle responsible for most of an action is...Ch. 20 - Assisting muscles of an agonist are called...Ch. 20 - Antagonists are muscles that resist the actions...Ch. 20 - When the forearm is extended at the elbow joint,...Ch. 20 - When the biceps brachii acts as the agonist, the...Ch. 20 - A _____________ is a synergistic muscle that will...
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- Which of the following sentences is NOT correct? A. White fibers make up fast-twitch muscle B. Muscle spindle is a type of receptor that detects muscle length C. Exocrine gland secretes its product directly into the bloodstream D. When an action potential is generated within a motor neuron, every muscle cell of the motor unit is stimulated to contractarrow_forwardWhen a higher voltage is applied to the skeletal muscle, the force of contraction _____ and recruitment of more motor units occurs called ________ summation. A. increases, spatial B. increases, temporal C. decreases, temporal D. decreases, spatialarrow_forwardThe contractile response in skeletal muscle A. produces more work when the muscle contracts isometrically than the muscle contracts isotonically. B. does not last as long as the action potential. C. produces more tension when the muscle contracts isometrically than when the muscle contracts isotonically. D. starts after the action potential is over. E. decreases in magnitude with repeated stimulation.arrow_forward
- Which of the following statements are true of the neuromuscular junction? (Read carefully and select all the correct statements.) A. A synapse is the space between two muscle fibers. B. Acetylcholine is released from vesicles in the sarcolemma. C. The axon terminal is the end of a sensory neuron. D. Acetylcholine makes the sarcolemma more permeable to calcium ions. E. Cholinesterase is an enzyme that destroys acetylcholine so that the impulse will continue at the same strength. F. The receptors for acetylcholine are in the sarcolemma.arrow_forwardWhen muscle fibers are stimulated so frequently they do not have an opportunity to relax, they are experiencing: a. unfused or incomplete tetanus. b. wave summation. c. fused or complete tetanus. d. twitch.arrow_forwardAll of the following characteristics apply to skeletal muscle except a. They are striated. b. They are multinucleated. c. They are voluntary. d. They contain intercalated discs. e. They are attached to the skeleton by means of tendons.arrow_forward
- The neurotransmitter that initiates events leading to skeletal muscle contraction is A. creatine kinase. B. creatinine. C. norepinephrine. D. acetylcholinearrow_forwardThe muscle system is responsible for a. producing red blood cells. b. providing a framework. c. moving the body. d. conducting impulses.arrow_forwardWhich of the following is true? A. Muscle fibers either will contract with all the force possible under existing conditions or will not contract at all. B. Skeletal muscles can contract with varying degrees of strength given different circumstances. C. Muscle length does not have an effect on contractile strength. D. Metabolic condition of the myocyte does not have an effect on contractile strength.arrow_forward
- Which of the following changes takes place when a skeletal muscle contracts?A. Z discs move farther apart.B. Actin filaments contract.C. Myosin filaments contract.D. Sarcomeres become shorter.arrow_forwardA bacterial toxin is known to block the release of ACh at the motor end plate of skeletal muscle. Consequently, a. the skeletal muscle contracts with increasing force. b. the skeletal muscle contracts with increasing frequency. c. the ability to stimulate the muscle is impaired. d. other neurotransmitters would stimulate the muscle.arrow_forwardMuscle that has a striped appearance is described as being a. elastic b. nonstriated c. excitable d. striatedarrow_forward
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