If you shine a light into one eye both pupils will constrict. The best explanation for this is ________
A) sensory input from the retinas of both eyes converges at the optic chiasm and information from each eye is delivered to both the left and right sides of the brain
B) information from one eye is directly and immediately transferred to the other eye to maintain alignment of the eyes
C) a small portion of light always enters the other eye
D) this in fact does not occur and information from both eyes is always separated
A
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A gene that stalls cell division if damaged DNA is present would be considered a proto-oncogene.
Answer the following statement true (T) or false (F)
Steroid hormones and thyroid hormones ________ pass across the plasma membrane; they cause the target cells to ________ that produce the characteristic effects of the hormones.
A. cannot; synthesize specific proteins B. can; activate or inactivate the cellular enzymes C. can; synthesize specific proteins D. cannot; activate or inactivate the cellular enzymes
The ischemic phase of the uterine cycle is brought on by vascular spasms, which in turn are a response to what?
A. Ovulation B. Menstruation C. Rising LH level D. Falling progesterone level E. Rising progesterone level
The autonomic nervous system carries out many somatic reflexes that are crucial to homeostasis
Indicate whether the statement is true or false