quiz two

monozygotic twins share _______ of their genes.

100 percent

a neuron has a(n) _______ that extends like a trunk from the cell body.

axon

monozygotic twins are important in the study of the relative influences of nature and nurture because differences between monozygotic twins are the result of nurture.

true

phoebe recently suffered a major fall in which she sustained brain injuries. since then, she has had immense difficulty in communicating with others. she appears to understand what others tell her, but her responses are slow and laborious. her sentences are always incomplete, with important grammatical words missing. which of the following conditions best reflects phoebe's case?

broca's aphasia

the electroencephalograph is a method of:

detecting brain waves by means of measuring the current between electrodes placed on the scalp.

the __________ is an oblong area of the hindbrain involved in regulation of heartbeat, blood pressure, movement, and respiration.

medulla

each kind of neurotransmitter has a unique chemical structure, and each can fit into a specifically tailored harbor, or __________, on the cell receiving a message.

receptor site

which of the following statements is true of hormones?

they are secreted directly into the bloodstream.

among lower animals, stimulation of various areas of the __________ can trigger instinctual behaviors such as fighting, mating, or nest building.

hypothalamus

claire, who is 11 months old, is just starting to crawl and walk. which of the following is heavily involved in this newfound ability?

myelination

__________ is produced largely by neurons in the brain stem and acts both as a neurotransmitter and as a hormone.

norepinephrine

direct artificial stimulation of the parietal lobe produces a sense of being touched somewhere on your body.

true

a __________ takes several x-rays to reveal deformities in shape and structure that are connected with blood clots, tumors, and other health problems.

computerized axial tomography scan