Human Anatomy (9th Edition)
9th Edition
ISBN: 9780134320762
Author: Frederic H. Martini, Robert B. Tallitsch, Judi L. Nath
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 7RFT
The theory that explains muscle contraction is formally known as the
(a) muscle contraction theory.
(b) striated voluntary muscle theory.
(c) rotating myosin head theory.
(d) sliding filament theory.
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(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.
Which of the following is not true when comparing slow twitch red and fast twitch white muscle fibers?
Question 2 options:
a)
Red contain more mitochondria than white
b)
Red contain more myoglobin than white
c)
Red contracts more slowly than white
d)
Red contain more glycogen stores than white
During the contraction of a vertebrate skeletal muscle fiber,calcium ions(A) break cross-bridges as a cofactor in hydrolysis of ATP.(B) bind with troponin, changing its shape so that the myosinbinding sites on actin are exposed.(C) transmit action potentials from the motor neuron to themuscle fiber.(D) spread action potentials through the T tubules.
Chapter 9 Solutions
Human Anatomy (9th Edition)
Ch. 9 - 1. Active sites on actin become available for...Ch. 9 - Prob. 2RFTCh. 9 - Prob. 3RFTCh. 9 - 4. Another name for a muscle that is a prime mover...Ch. 9 - Prob. 5RFTCh. 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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- What is the function of the sarcoplasmic reticulum in muscle cell contraction?arrow_forwardWhat is a motor unit? Why does a rapid series of muscle twitches yield a stronger overall contraction than a single twitch?arrow_forwardPlace these structures in order from LARGEST structure to SMALLEST: A) Myofibril B) Myofilament (MYOSIN) 1 C) Muscle Body D) Muscle Bundle (Fascicle) E) Muscle Fiber F) Myofilament (ACTIN)arrow_forward
- A muscle fiber is the same thing as a: a) myofibril. b) myocyte. c) myofilament. d) fascicle.arrow_forwardThe 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............greaterarrow_forwardWhich of the following muscle cell components helps spread the depolarization of the muscle cell membranes throughout the interior of muscle cells? (A) Actin (B) Myosin CT tubule (D) Tropomyosin (E) Troponin (F) Z diskarrow_forward
- Slow twitch muscle fibers are characterized by all of the following EXCEPT: O a) used in endurance type of activities O b) contract rapidly and forcefully Oc) resistant to fatigue O d) have a direct relationship to the oxidative energy systemarrow_forwardThe size of a motor unit (i.e., the # of muscle fibers innervated) can directly influence which of the following? a.) Ability to finely increase or decrease force produced during a movement b.) Ability to produce force for long duration c.) Speed (velocity) of a movement d.) The arrangement of actin and myosin within the sarcomerearrow_forwardidentify the incorrect statement about skeletal muscle (A) the epimysium, perimysium, and endomysium form the tendon of the muscle (B) when putting down a weight (extending the elbow) the biceps brachii muscle is doing a concentric isotonic contraction (C) when doing a knee flexion, the hamstrings muscle group is the agonist (D) holding a plank is an example of an isometric contractionarrow_forward
- Outline the role of calcium ions on muscle contraction during a biceps curl. In your answer: A) Describe the role of the nervous system in stimulating the release of calcium ions. b) Outline the role calcium ions play in the 'sliding filament theory?'arrow_forwardAn energy storage compound that can be stockpiled in muscle cells for short-term use is (a) myoglobin (b) ADP (c) troponin (d) myosin (e) creatine phosphatearrow_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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