Answered: The fast fatigable motor units are used…

Science

Biology

The fast fatigable motor units are used predominantly for which of the following activities

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter32: Structural Support And Movement

Section: Chapter Questions

Problem 12SA

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Concept explainers

Spheres of physical activity

The spheres of physical activity experience include aspects of everyday life where physical activity is important. In general, the spheres recognize various purposes of physical activity in different contexts. The spheres of physical activity provide a broad basis for assessing the significance and prevalence of physical activity. There are seven spheres of physical activity experience.

Question

The fast fatigable motor units are used predominantly for which of the following activities?

a.Sleeping.

b.Jumping.

c.Walking.

d.Sitting.

e. Standing.

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Which of the following correctly lists the structures that make up a motor unit? a. motor neuron plus some of the muscle fibers it innervates b. motor neuron plus all of the muscle fibers it innervates c. motor neuron plus one of the muscle fibers it innervates d. all of the above e. none of the above
While initial control of skeletal muscles occurs with the motor cortex, a successful movement also requires efferent feedback from joint, tendon and other proprio- ception sensors. Ultimately, complete control and coordination of motor movements requires the operation of: a. The cerebellum b. The hippocampus c. The vestibular apparatus d. The lateral ventricles
To demonstrate muscle fatigue, a student held an 8 lb dumbbell in her hand and abducted her arm parallel to the floor. After 45 seconds, she has having difficulty holding that position so she rotated her hand 90 degrees. This allowed her to hold the dumbbell in position for an additional 20 seconds. Which of the following is the best explanation for this? A. Different motor units were contracting while others were relaxing. B. Muscles began to contract isotonically rather than isometrically. C. The load was reduced. D. The resistance to contraction was reduced. E. The change in position provided a greater range of motion at the shoulder.
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