BIOLOGY: ESSENTIALS >LL< W/ CONNECT
3rd Edition
ISBN: 9781260635379
Author: Hoefnagels
Publisher: MCG
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Chapter 26, Problem 5MCQ
Summary Introduction
Introduction:
Skeleton is a hard structure that protects the internal organs of a living organism. A system, composing bones, muscles, and other tissues that help in the movement and locomotion in an individual, is called a skeletal system.
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Which of the following is arranged in order from smallest tolargest?a. Motor unit < sarcomere < muscle cell < actin subunitb. Muscle cell < actin subunit < sarcomere < motor unitc. Actin subunit < sarcomere < muscle cell < motor unitd. Sarcomere < motor unit < actin subunit < muscle cell
Which of the following statements best describes the sliding filament mechanism of muscle contraction?
a. Actin and myosin filaments do not shorten, but rather, slide past each other.
b. Actin and myosin filaments shorten and slide past each other.
c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten.
d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.
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 contract
Chapter 26 Solutions
BIOLOGY: ESSENTIALS >LL< W/ CONNECT
Ch. 26.1 - How do the skeletal and muscular systems interact?Ch. 26.1 - Prob. 2MCCh. 26.1 - Prob. 3MCCh. 26.2 - Prob. 1MCCh. 26.2 - Prob. 2MCCh. 26.3 - Prob. 1MCCh. 26.3 - Prob. 2MCCh. 26.3 - Prob. 3MCCh. 26.3 - Prob. 4MCCh. 26.3 - Prob. 5MC
Ch. 26.4 - Prob. 1MCCh. 26.4 - Prob. 2MCCh. 26.4 - Prob. 3MCCh. 26.4 - Prob. 4MCCh. 26.4 - Prob. 5MCCh. 26.5 - Prob. 1MCCh. 26.5 - What happens when a muscle cell can not generate...Ch. 26.6 - Prob. 1MCCh. 26.6 - Prob. 2MCCh. 26 - Prob. 1MCQCh. 26 - Prob. 2MCQCh. 26 - Prob. 3MCQCh. 26 - Prob. 4MCQCh. 26 - Prob. 5MCQCh. 26 - Prob. 6MCQCh. 26 - Prob. 7MCQCh. 26 - Prob. 8MCQCh. 26 - Prob. 9MCQCh. 26 - Distinguish among a hydrostatic skeleton, an...Ch. 26 - Explain the observation that animals with...Ch. 26 - Prob. 3WIOCh. 26 - Prob. 4WIOCh. 26 - Prob. 5WIOCh. 26 - Prob. 6WIOCh. 26 - Prob. 7WIOCh. 26 - Prob. 8WIOCh. 26 - Prob. 9WIOCh. 26 - How might your muscles lengthen when you stretch?...Ch. 26 - How do the effects of exercise or lack thereof...Ch. 26 - Prob. 12WIOCh. 26 - Search the Internet for disorders of the skeletal...Ch. 26 - What is role of calcium in bones? In muscle...Ch. 26 - The following table shows recent mens world-record...Ch. 26 - Prob. 1SLCh. 26 - Prob. 1PITCh. 26 - Prob. 2PITCh. 26 - Prob. 3PITCh. 26 - Prob. 4PIT
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- Which component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsarrow_forwardWhich 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_forwardWhich of the following is the site of calcium ion storage within muscles? a. T tubules b. sarcoplasmic reticulum c. actin filaments d. myosin filamentsarrow_forward
- The mechanism of muscle contraction is best explained by the sliding filament model. According to this model, thin ___i___ filaments slide over thick ___ii___ filaments.The statement given above is completed by information in row Row i ii A. myosin actin B. myosin myosin C. actin actin D. actin myosinarrow_forwardDuring muscle contraction, calicum ions bind to A. Actin Filaments B. Tropomyosin C. Troponin D. Myosin Filamentsarrow_forwardWhen sarcomeres contract during muscle contraction, which of the following occurs? A. The myosin filaments lengthen. B. The myosin filaments "walk" along the actin microfilaments. C. The myosin filaments shorten. D. The actin filaments shorten.arrow_forward
- Which of the following lists the structures from largest to smallest?a. motor unit, muscle, myofibril, muscle fiber, thick and thin filamentsb. muscle, muscle cell, myofibril, muscle fiber, actin and myosinc. muscle cell, thick and thin filaments, sarcomere, myofibrild. muscle, muscle fiber, myofibril, thick and thin filamentsarrow_forwardWhich protein is not part of the thin filament in a muscle fiber? A. Actin B. Myosin C. Tropomyosin D. Troponinarrow_forwardWhich of the following could prevent skeletal muscle from contracting? Select one or more: a. Preventing calcium from surrounding myofibrils. b. Maintaining high levels of calcium around myofibrils c. Preventing sodium from entering a cell d. Allowing constant entry of sodium into a cellarrow_forward
- What structure in skeletal muscle cells functions in calcium storage? a.myofibrillar network b.sarcoplasmic reticulum c.intermediate filament network d.mitochondriaarrow_forwardThe Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d. tropomyosinarrow_forwardWhich of the following statements about the connective sheath of skeletal muscle is false? a. the endomysium wraps around every single muscle fiber b. the perimysium wraps around groups of muscle fibers c. the epimysium wraps around the whole muscle organ d. all of the above e. none of the abovearrow_forward
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