Natural killer (NK) cells ________.
A) are also called cytotoxic T cells
B) are a type of phagocyte
C) are cells of the adaptive immune system
D) can kill cancer cells before the immune system is activated
D) can kill cancer cells before the immune system is activated
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Which is true of sex hormones?
A. They stimulate ossification of the epiphyseal plates. B. Their action on bone growth is stronger in males than in females. C. They have no effect on bone. D. They inhibit osteoblast activity.
Which feedback loop is responsible for the magnification of uterine contractions during childbirth?
What will be an ideal response?
When the left ventricle contracts, the diameter of the ventricular chamber
A) increases. B) decreases. C) remains the same.
A neuromodulator
A. inactivates neurotransmitters. B. acts as a neurotransmitter. C. is a receptor site for a neurotransmitter. D. is a substance released from neurons that influences the sensitivity of neurons to neurotransmitters. E. has no influence on the amount of neurotransmitter released.