Deterioration in the myelin sheaths of motor axons to

the lower leg would be expected to
a. remove the restraints to ion movement and speed
up impulse transmission.
b. cause immobility of the leg due to cessation of
impulses to leg muscles.
c. slow the rate of transmission and cause reduced
motor control.
d. have little effect because the sheaths are for
insulation only.
e. do none of these.


Answer: c

Biology & Microbiology

You might also like to view...

An earthworm detects sound

a. through specialized tympanic membranes located near the head. b. through a thinned region of the exoskeleton. c. through general mechanoreceptors on its skin. d. by using a specialized organ that measures the frequency of vibration of the surrounding dirt particles. e. through a series of mechanoreceptors arranged in a lateral line.

Biology & Microbiology

Which of the following is (are) NOT trend(s) of

vertebrate evolution? a. conversion of the support for locomotion from the notochord to the vertebral column b. expansion of the nerve cord to form the brain and spinal cord c. changes in the respiratory system from gills to lungs with accompanying changes in the circulatory system d. the development of fewer, more efficient chambers in the heart e. modification of limbs for more efficient movement

Biology & Microbiology

Raccoons and squirrels can become familiar to and stop reacting to loud noises, sights, and actions of people in cities or suburbs. They react differently from how they would if they encountered people in the wild. This is an example of

A. imprinting. B. reflex. C. habituation. D. observational behavior. E. taxis.

Biology & Microbiology

The function of chymotrypsin is to:

A) synthesize proteins. B) break down proteins into amino acids. C) synthesize glycogen. D) break down glycogen into glucose.

Biology & Microbiology