Photoreceptors are modified neurons. However, they differ from most neurons in the fact that ________
A) photoreceptors do not have fluctuations in membrane potential
B) photoreceptors do not release neurotransmitters
C) photoreceptors are sensitive to energy changes in the external environment
D) photoreceptors will hyperpolarize when stimulated
D
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Compared to the inside of the resting plasma membrane, the outside surface of the membrane is
A) positively charged. B) electrically neutral. C) negatively charged. D) continuously reversing so that it is positive one second and negative the next. E) negatively charged whenever the Na+ (--)K+ pump is operating.
By blocking the effect of acetylcholine at muscarinic but not nicotinic receptors, atropine is able to block parasympathetic effects while not influencing sympathetic activity at all
Indicate whether the statement is true or false
Each NADH molecule fed into the electron transport chain produces approximately ________ ATPs.
A. 2 B. 3 C. 4 D. 5 E. 6
Which of the following structures secrets hormone renin?
a. Peritubular capillaries b. Glomerular capillaries c. Nephronic tubules d. Juxtaglomerular apparatus e. Bowman's capsule