Many axons, especially the larger ones, are insulated with a myelin sheath. What kind of cells make up the myelin sheath? What does the myelin sheath look like? What are two purposes of the myelin sheath?
What are two purposes of the myelin sheath? What happens when a person experiences the loss of myelin?
What will be an ideal response?
A good answer will include the following key points:
• Myelin is a fatty sheath formed by glial cells.
• It occurs in segments along the axon and looks like a string of link sausages.
• Its key functions are to prevent signals in adjacent cells from interfering with each other and to speed up conduction of neural impulses.
• In individuals with multiple sclerosis, loss of myelin causes erratic nerve signals resulting in things like loss of sensation, muscle weakness or paralysis, lack of coordination, or vision problems.
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If an individual was to undergo a personality assessment in 1960, which of the following would have been available for the clinician to use?
a. Rorschach b. TAT c. MMPI d. all of the above
Six-month-old Cyeadra is quietly playing with her feet after waking from her afternoon nap while at her daycare center. Three-month-old Sean wakes from his nap and begins to cry. Upon hearing Sean’s cry, the once-contented Cyeadra begins to cry. This
scenario illustrates the concept of __________. a) reflexive crying b) still-face paradigm c) emotional contagion d) reactionary contagion