What do these results tell you about when and how much you use your extensor muscles? 3.52.521.510.5rest Hand flexedwith weightrest Handrest Handextendedextended withweightHand PositionsFigure 1. Muscle Electrical Activity for Different Hand PositionsChange in Electrical Activity (mV)

Humans have a well-developed muscular and skeletal system for the movement and locomotion of the…

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What do these results tell you about when and how much you use your extensor muscles?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter38: The Musculoskeletal System

Section: Chapter Questions

Problem 34CTQ: Describe the joints and motions involved in taking a step forward if a person is initially standing...

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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.

Question

What do these results tell you about when and how much you use your extensor muscles?

3.5
2.5
2
1.5
1
0.5
rest Hand flexed
with weight
rest Hand
rest Hand
extended
extended with
weight
Hand Positions
Figure 1. Muscle Electrical Activity for Different Hand Positions
Change in Electrical Activity (mV)

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