A temporary cell that is no longer useful for development undergoes preprogrammed cell death. During this process,
A. the cell can no longer adhere to other cells.
B. the cytoskeleton forms large, complex structures.
C. mitochondria merge.
D. chromosomes join.
Answer: A
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When a woman is giving birth, the head of the baby pushes against her cervix and stimulates the release of the hormone oxytocin. Oxytocin travels in the blood and stimulates the uterus to contract. Labor contractions become more and more intense until the baby is expelled. This is an example of ________.
A. integration control B. dynamic equilibrium C. positive feedback D. set point adjustment E. negative feedback
The secretion of follicular-stimulating hormone is controlled by ________.
A. a releasing hormone from hypothalamus B. the concentration of water in body fluids C. action potentials from the hypothalamus D. a releasing hormone and an inhibiting hormone from hypothalamus
To focus on objects closer than 20 feet,
A. the lens must become flatter. B. the cornea must move inward. C. the retina must bend. D. the ciliary muscles must contract. E. the suspensory ligaments increase tension on the lens.
The ________ covers most of the exposed surface of the eye.
-cornea -iris -conjunctiva -anterior chamber -canthus