heids17043
16.10.2019 •
Health
Since skeletal muscle movements are controlled by nerve impulses, in which of the following would you expect the ratio of motor neurons to muscle fibers to be the greatest?
a. large muscles of the upper arm
b. postural muscles of the back
c. muscles that control eye movements
d. the calf muscles
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Ответ:
*100% CORRECT ANSWERS
Question 1
Which of the following is not a function of skeletal muscle?
control blood vessel diameter
Question 2
Interactions between actin and myosin filaments are responsible for
muscle contraction
Question 3
At rest, active sites on actin are blocked by
tropomyosin molecules
Question 4
When energy reserves in a muscle are exhausted or lactic acid levels increase,
fatigue occurs and contraction is no longer possible
Question 5
The more movable end of a muscle is the
insertion
Question 6
Rigor mortis occurs in skeletal muscles a few hours after death. This is most likely due to
decreased ATP production and increased membrane permeability to calcium
Question 7
Each of the following changes in the skeletal muscle is a consequence of aging except one. Identify the exception.
muscle fibers increase their energy reserves
Question 8
Because skeletal muscle contractions require large amounts of ATP, you would expect skeletal muscle to have
a rich blood supply
Question 9
Since skeletal muscle movements are controlled by nerve impulses, in which of the following would you expect the ratio of motor neurons to muscle fibers to be the greatest?
muscles that control eye movements
Question 10
Which of the following activities would use isometric contractions?
maintaining upright posture
Question 11
A person whose genetic makeup makes him/her a better marathon runner than a sprinter probably has ___ in his/her leg muscles.
slow fibers
Question 12
The area of the sarcomere containing the thick filaments is the
A band
Question 13
When a calcium ion binds to troponin,
tropomyosin moves out of the actin active sites
Question 14
The degree of relative movement is greater in the
pectoral girdle
Question 15
Based on what you've learned about how muscles are named, which muscle would you expect to contract when grasping an object in the hand?
flexor digitorum
Ответ:
option 2
Explanation:
yes