What is myelin?

What will be an ideal response?


Ans: a membrane that encloses portions of some neurons and acts as an electrical insulator

Biology & Microbiology

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Ruminants have how many chambers in their stomachs?

a. one b. two c. three d. four e. five

Biology & Microbiology

Flight requires greater efficiency of oxygen delivery. Therefore, birds have a unique respiratory system that allows them to filter oxygen. During the initial inhalation, the air passes through the trachea and into the . During the second inhalation, the oxygen-depleted gas moves to the , and is then exhaled.

A. posterior air sacs; anterior air sacs B. lamellae of the gills; anterior air sacs C. anterior air sacs; posterior air sacs D. lamellae of the gills; bronchioles E. bronchioles; capillaries

Biology & Microbiology

Which of the following receive(s) a physical or chemical stimulus and ultimately cause(s) nerve impulses to be generated in sensory neurons?

A) the brain B) axons C) Schwann cells D) hillocks E) receptors

Biology & Microbiology

The three-base sequences on mRNA that code for a particular amino acid are called ___________

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology