Which of the following occurs when a hormone binds to a nuclear receptor?
A. Increased lipid synthesis by ribosomes
B. Alters membrane permeability
C. Opens membrane channels
D. Activation of mRNA synthesis
E. Activation of cyclic AMP
Answer: D
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Neuronal divergence occurs when axons from one preganglionic cell synapse on numerous ganglionic cells.
Answer the following statement true (T) or false (F)
Below are several structures from the frog heart. Select the correct sequence that lists the structures from the one with the highest rate of contraction, to the one with the lowest rate of contraction
A) sinus venosus, atria, ventricle B) atria, ventricle, sinus venosus C) atria, sinus venosus, ventricle D) ventricle, atria, sinus venosus
The normal human blood pH is:
a. 6.80 to 7.40 b. 7.25 to 7.35 c. 7.35 to 7.45 d. 7.40 to 7.60
Which of the following is the first step in the process of fertilization?
A. A sperm fuses with the egg's plasma membrane. B. The sperm nucleus enters the egg, and the egg immediately prevents any further sperm from gaining access by forming a fertilization membrane that a sperm cannot penetrate. C. The capacitated sperm release their acrosomal enzymes to penetrate through the cells surrounding the egg. D. The nuclei of the sperm and egg rupture within the fertilized egg and the chromosomes mix to form a single nucleus.