Which of the following substances may diffuse through the lipid bilayer of the plasma membranes of

brain capillaries and enter the brain?
a. nicotine
b. caffeine
c. alcohol
d. barbiturates
e. all of these


E

Biology & Microbiology

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Hantavirus pulmonary syndrome is a viral respiratory disease caused by contact with

A) rat fleas. B) rodents. C) mosquitoes. D) bats.

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DNA damage is sensed by E2F at the G1 and G2 checkpoints

Indicate whether the statement is true or false

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How does contraction of the diaphragm cause the lungs to fill with air?

What will be an ideal response?

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Which component of a muscle does the calcium ion combine with to allow a contraction to occur?

A) myosin head B) T tubule C) actin D) troponin

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