A class of lipids used as chemical messengers, to signal cells to undergo changes, is called
A) polysaccharides.
B) phospholipids.
C) triglycerides.
D) steroids.
E) monoglycerides.
D) steroids.
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Define the underlined terms in the following case study. The clinic admitted for observation a Rattus rattus specimen believed to have been domesticated following research use. According to the owner, the rodent, which was an albino, had been having difficulty acclimatizing. In addition, the owner expressed concern that, despite its former axenic surroundings, the specimen was a vector arising
from its laboratory use. What will be an ideal response?
Saltatory conduction
a. occurs in unmyelinated nerve fibers. b. is slower than conduction by local current flow because the myelin acts as an insulator to slow the impulse down. c. involves the impulse jumping from one node of Ranvier to the adjacent node. d. refers to the action potential spreading from one Schwann cell to the adjacent Schwann cell. e. more than one of these answers.
Which factors contribute to the generation of the resting membrane potential? select all that apply.
-the electrical attraction of cations and anions to each other. -selective permeability of the membrane, allowing some ions to pass more easily than others -diffusion of ions down their concentration gradients through the membrane. the movement of water across the membrane into a region of higher concentration of solute -the electrical attraction of cation and anions to each other -selective permeability of the membrane, allowing some ions to pass more easily than others. -diffusion of ions down their concentration gradients through the membrane
The water and pH levels should be checked monthly
Indicate whether the statement is true or false