Answered: What are some…

What are some adaptations/specializations that we see in skeletal muscle fibers that increase their ability to carry out aerobic respiration to produce ATP?

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 2UC

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Concept explainers

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.

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What are some adaptations/specializations that we see in skeletal muscle fibers that increase their ability to carry out aerobic respiration to produce ATP?

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Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
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In the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.
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One of the primary characteristics of all muscle tissue is contractility, the ability to shorten (contract) and lengthen (relax). You've identified the various components of a myofibril above. Now, use the table below to indicate what occurs to each band, line, or zone when the muscle contracts vs. relaxes. What occurs to this region / structure during contraction/relaxation? Region / Structure A-Band H-Band I-Band M-Line Z-Line Zone of Overlap Sarcomere No change Shortens Lengthens Muscle Contraction Muscle Relaxation
In normal skeletal muscle contraction, which of the following represents the correct sequence of events? 1. Action potential 2. Ca2+ release into cytoplasm 3. Interaction between actin and myosin filaments 4. Ca2+ is pumped back to cisterns 5. Depolarization of T tubules Answers A-F A 1-2-5-3-4 B C 1-4-5-3-2 1-5-2-3-4 D 5-1-2-3-4 E F 5-4-3-1-2 5-4-1-3-2 O
During evolution, skeletal muscle became adapted to functional de-mands ranging from sudden, withdrawal movements of a startled worm, to the sustained contractions required to maintain mammalian posture, to supporting a long, fast chase across an African savanna. What are some of the fiber types in vertebrate muscle that evolved to support these kinds of activities?