Which of the following does not influence smooth muscle activity?
a. autonomic neurotransmitters
b. mechanical stretch
c. hormones
d. alpha motor neurons
e. local metabolites
D
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You would expect an injection of an opiate drug into the ventral tegmental area (VTA) would activate dopamine neurons in the:
a) nucleus accumbens. b) medial septal region. c) periaqueductal gray matter. d) preoptic area.
Answer the following statements true (T) or false (F)
1. Amacrine cells modulate communication between two layers of cells in the retina. 2. Bipolar cells give off axons to the optic nerve. 3. The rods and cones of the retina synapse with approximately six million ganglion cells. 4. Retinal cells that provide color vision are the horizontal cells. 5. Retinal cells that enable people to see in low light conditions are the rods.
What is the most likely reason humans have only two nipples?
A. Our primate ancestors probably had litters. B. Primates generally have only one offspring. C. Having two nipples is associated with upright walking (bipedality). D. Most mammals have only two nipples. E. The number of nipples was reduced in humans due to sexual selection.
The parathyroid gland secretes parathyroid hormone and calcitonin
Indicate whether the statement is true or false