What occurs when depolarization is less than the cell's threshold?
a. Sodium is prevented from crossing the membrane.
b. Potassium is prevented from crossing the membrane.
c. Sodium crosses the membrane only slightly more than usual.
d. The cell will still produce an action potential.
Question 2
After damage to the preoptic area, an animal ____.
a. eats a great deal and gains weight
b. stops eating
c. fails to sweat when overheating, but still shivers when cold
d. fails to shiver and sweat sufficiently
Checkpoints in the cell cycle.
A phage cross made by doubly infecting the host cell with parental phages
(A) The structure of a neuron, showing the dendrites, nerve cell body, and axon. (B) Photomicrograph
Stem cell division and differentiation
Color-enhanced electron micrograph of E. coli undergoing cell division