The key characteristic of a malignant tumor is that such a tumor
a. does not require surgery.
b. cannot cause brain damage.
c. has a distinct border.
d. spreads rapidly through infiltration of adjacent tissue.
e. can give off cancerous cells that in turn reach distant sites.
Answer: e. can give off cancerous cells that in turn reach distant sites.
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Which of the following receptor cells can never be replaced after they have been damaged?
A. olfactory receptor cells in the nose B. hair cells in the inner ear C. taste receptor cells on the tongue D. skin cells on the fingers
During a negative after-potential, there is an outward flow of which of the following from the axon?
a. neuropeptides b. potassium ions c. neurotransmitters d. sodium ions
The sensory receptors of your eyes are able to convert light energy into neural energy, which can then be utilized by the brain. Thus, the sensory receptors in your eyes act as
a. visual adapters. b. biological assimilators. c. phosphenes. d. biological transducers.
Mothers who are impatient with their infants and who prefer other activities to
interacting with their infants are likely to foster __________ attachment. a. secure b. resistant c. avoidant d. ambivalent e. unsuccessful