What function is served by the increased axon diameter at the nodes of Ranvier?
What will be an ideal response?
Increased diameter results in increased surface area on the membrane for sodium channels. This results in increased speed of impulse propagation.
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If you need to design a drug to cross the plasma membrane of the blood-brain barrier cells quickly, where would you start?
A. With a large uncharged molecule B. With a small charged molecule C. With a lipid-soluble molecule D. With a water-soluble molecule
Which of the following statements about the respiratory membrane is true?
a. the membrane consists of the fusion of the simple squamous epithelia of an alveolus with the endothelium of a pulmonary capillary b. the membrane is very thin, approximately 0.5 micrometers c. oxygen and carbon dioxide diffuse quickly because of the large surface area of the respiratory membrane d. all of the listed statements are true
Which of the following elements is included in hemoglobin molecules?
A. Iodine B. Cobalt C. Iron D. Copper
On a muscle fiber, the two terminal cisternae and the centrally placed T-tubule form a structure called a ______________
Fill in the blank with correct word.