Phototransduction in invertebrates differs from that in vertebrates in that in invertebrates
a. no G-proteins are involved.
b. no cation channels are involved.
c. no opsins are involved.
d. photoreceptors depolarize in response to stimulation.
e. first-order cells hyperpolarize in response to stimulation.
D
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Which of the following structures in the inner ear transmits sound?
A. Bony labyrinth B. Semicircular canal C. Vestibule D. Cochlea
The hypothalamus ____________________.
It is consider the master gland. excerts the highest level of endocrine control secretes regulatory hormones Only B and C are correct all choices are correct
Another name for the anterior body cavity is the ________ cavity.
A. cranial B. ventral C. dorsal D. oral
Which of the following statements regarding PTH (parathyroid hormone) is true?
A. PTH causes increased Na+ reabsorption in the kidneys. B. PTH causes increased reabsorption of Ca2+ in the kidneys. C. PTH causes increased loss of Ca2+ from the kidneys. D. PTH causes decreased uptake of Ca2+ from the small intestine. E. PTH causes decreased vitamin D formation in the kidneys.