Human Biology: Concepts and Current Issues (8th Edition)
Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134312729
Author: Johnson
Publisher: PEARSON
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Chapter 6, Problem 15TY
Summary Introduction

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All the three types of muscles are either voluntary, an individual can control their movement, or involuntary, an individual cannot control their movement.

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In muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules.  If a person has too high a concentration of magnesium ions in the blood, magnesium ions can prevent calcium ions from binding troponin.  A) What effect would this have on muscle contraction (strengthen, weaken, or no effect)?  B) Use your knowledge of how muscle fibers contract to explain your answer in part A.
Which is a false statement about skeletal muscle structure?a. A myofibril is composed of multiple muscle fibers.b. Most skeletal muscles attach to bones by connective-tissue tendons.c. Each end of a thick filament is surrounded by six thin filaments.d. A cross-bridge is a portion of the myosin molecule.e. Thin filaments contain actin, tropomyosin, and troponin.
A.What type of contractions do skeletal muscles do? B. What type of contractions do cardiac muscles do? C.a. What type of contractions do smooth muscles do?

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Human Biology: Concepts and Current Issues (8th Edition)

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