Pearson eText Human Anatomy -- Instant Access (Pearson+)
9th Edition
ISBN: 9780135212936
Author: Frederic Martini, Robert Tallitsch
Publisher: PEARSON+
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Chapter 9, Problem 2RFT
Summary Introduction
Introduction:
Blood vessels and nerves providing the muscle fibers are found inside the connective tissue of the endomysium, perimysium, and epimysium. Skeletal muscles are also commonly known as voluntary muscles. This is so because their contractions can be controlled consciously.
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If a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative to a normal muscle fiber? Assume sarcoplasmic reticulum can still react to activity at the neuromuscular junction.
a)Less tension would be created.
b) No difference in tension creation.
c) More tension would be created.
d) No tension would be created.
In skeletal muscle, the sarcolemma is directly covered by:
a) epimysium.
b) perimysium.
c) endomysium.
(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.
Chapter 9 Solutions
Pearson eText Human Anatomy -- Instant Access (Pearson+)
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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- A muscle fiber is the same thing as a: a) myofibril. b) myocyte. c) myofilament. d) fascicle.arrow_forwardWhich of the following is found on the outside of skeletal muscles? a). Myofibrilsb). Sheathc). Bundlesd). Sarcomerearrow_forwardDuring 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.arrow_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_forward16) when a skeletal muscle contracts, it usually moves the bone at one end much more than the bone at its other end. The attachment of the muscle to the less moveable bone is called its a) insertion b) ligament c) origin d) flexorarrow_forward(a) What are myofibrils? (b) Which components of the sarcoplasm separate the myofibrils in a fiber from one another?arrow_forward
- Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the “double strand of pearls” described in the video? (d) What gives a skeletal muscle fiber its striated appearance?arrow_forwardMuscular strength is defined as the: a) ability of a muscle to contract with maximal force O b) ability to move the joints through a full range of motion O c) ability to sustain a given level of muscular tension over time d) amount of force a muscle can produce repeatedly over 60 secondsarrow_forwarda) At what time point would a muscle begin to fatigue? Comment on the percentage decrease in contraction force by the end of a stimulus. b) Provide a possible mechanism for why would a muscle won't be able to maintain a prolonged contraction. c) Would the results be different if it was from smooth muscle tissue? Why?arrow_forward
- 13) skeletal muscle fibers contract because thick filaments slide over and between thin filaments toward the center of the sarcomere? a) true b) falsearrow_forwardOutline 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_forwardA) Assuming that each individual muscle fiber generates the same amount of tension, which of the following skeletal muscles will produce the greatest amount of overall tension when fully stimulated? Muscle Total Number of Muscle Fibers in Muscle A 150 B 1000 C 600 Group of answer choices Muscle A Muscle B Muscle C B)The following list of events take place during a muscle contraction. Place the events in chronological order as they relate to a muscle contraction. Calcium is released from the sarcoplasmic reticulum. Myosin heads bind to actin. An action potential arrives at the axon terminal of a motor neuron. Calcium binds to troponin, displacing tropomyosin and exposing myosin head binding sites on actin. Myosin heads undergo power stroke and actin slides over myosin towards M line of sarcomere. Acetylcholine is released at the neuromuscular junction.arrow_forward
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