Human Anatomy (8th Edition) - Standalone book
8th Edition
ISBN: 9780321883322
Author: Frederic H. Martini, Robert B. Tallitsch
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 5RFT
Another name for a muscle that is a prime mover is
(a) agonist. (b) antagonist.
(c) synergist. (d) fixator.
i
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A muscle that helps an agonist by causing a similar movement or by stabilizing a joint over which the agonist acts is (a) an antagonist, (b) a prime mover, (c) a synergist, (d) a fulcrum.
(a) Describe the roles of ATP in the sliding filament mechanism of skeletal muscle contraction.
(b) Describe the basic sequence of events that occurs as an action potential arrives at the neuromuscular junction and is transmitted to the muscle cell for contraction.
The greater the number of _________ involved in a motor unit, the ________ the degree of fine muscle control.
Question 9 options:
a)
muscle fibers............less
b)
ligand gated channels………….less
c)
layers of epimysium.........less
d)
muscle fibers............greater
Chapter 9 Solutions
Human Anatomy (8th Edition) - Standalone book
Ch. 9 - 1. Active sites on actin become available for...Ch. 9 - Prob. 3RFTCh. 9 - Prob. 4RFTCh. 9 - 4. Another name for a muscle that is a prime mover...Ch. 9 - Prob. 1RFTCh. 9 - Prob. 6RFTCh. 9 - 7. The theory that explains muscle contraction is...Ch. 9 - Prob. 8RFTCh. 9 - Label the illustrations to the right as...Ch. 9 - Prob. 1RC
Ch. 9 - 2. The ability to recover from injuries in older...Ch. 9 - Prob. 3RCCh. 9 - Prob. 4RCCh. 9 - Prob. 5RCCh. 9 - A motor unit from a skeletal muscle contains 1500...Ch. 9 - 7. What is the role of the zone of overlap in...Ch. 9 - Several anatomy students take up weight lifting...Ch. 9 - Prob. 2CT
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- If a muscle is contracted and shortening, what happens to the following: (a) width of the A band, (b) width of the H zone, (c) relationship of the Z discs, and (d) width of the I band?arrow_forwardIn the context of muscles, define (a) agonist, (b) antagonist, and (c) synergist. Why are there muscles that can “undo” actions produced by other muscles?arrow_forwardThe connective tissue that lies just outside the sarcolemma of an individual muscle cell is called the (a) epimysium, (b) perimysium, (c) endomysium, (d) endosteum.arrow_forward
- Distinguish between (a) direct and indirect muscle attachments and (b) a tendon and an aponeurosis.arrow_forwardContraction elicited by a single brief stimulus is called (a) a twitch, (b) wave summation, (c) multiple motor unit summation, (d) fused tetanus.arrow_forwardIf you were doing sit-ups, which muscle group would you be working the most (if you were using correct form)? A) Gluteus MaximusB) QuadricepsC) Rectus AbdominusD) Bicepsarrow_forward
- What would happen without input from gamma motor neurons? A) Information about velocity would continue, but information about length would no longer be possible. B) The spindles would be unable to provide feedback as the muscle contracted. C) Neither the intrafusal nor extrafusal fibers would contract. D) The extrafusal fibers would not contract, but the intrafusal fibers would continue to contract.arrow_forwardIn skeletal muscle, the sarcolemma is directly covered by: a) epimysium. b) perimysium. c) endomysium.arrow_forwardA muscle whose fascicles are arranged at an angle to a central longitudinal tendon has this arrangement: (a) circular, (b) longitudinal, (c) parallel, (d) pennate, (e) convergent.arrow_forward
- The functions of muscles may include: (more than one answer may apply) (A) Generation of force (B) Generation of motion (C) Generation of heat (D) Endocrinearrow_forwardWhich of the three lever systems involved in muscle mechanics would be the fastest lever—first-, second-, or third-class?arrow_forwardMuscular endurance is defined as the: O a) ability of a muscle to contract repeatedly over an extended period of time b) amount of force a muscle can produce with a single maximal effort O c) ability to move the joints through a full range of motion O d) amount of time required to contract a muscle completelyarrow_forward
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