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Bio 151 Final Exam Solutions
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- USMLE Step 1 Pharm
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- USMLE Step 1 Pharm
Bio 151 Final Exam Solutions
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Bio 151 Final Exam Solutions(T/F) As an organism gets larger (grows), its volume increases and its surface area
decreases. - ANS-False
When comparing two organisms of different size (for example, a mouse and an
elephant), the larger animal (elephant) has a(n) __________ surface area to volume
ratio than the smaller animal (mouse). - ANS-Smaller
The main role of the Na/K pump is to: - ANS-Export three sodium ions, import two
potassium ions, and help maintain cell membrane resting potential.
Which of the following correctly pairs neuron structure with function? -
ANS-Voltage-gated sodium channels allow the influx of sodium into the cell.
Mojave toxin, the principle toxic component of the venom of the Mojave rattlesnake, is a
protein complex that specifically binds to voltage gated Ca++ channels, but not to Na+
or K+ channels. Mojave toxin permanently prevents depolarization-mediated Ca++ entry
into nerve terminals. It's lethal effects result from: - ANS-An inability to transmit
neurotransmitters from one neuron to the next.
Glial cells, such as astrocytes, provide which of the following benefits to neurons? -
ANS-A) Repair damage with scar tissue
B) Provide energy (e.g. lactose) when needed
C) Provide physical structure/support
D) Clearance of neurotransmitters from the synaptic cleft
**ALL OF THESE OPTIONS ARE CORRECT**
During an excitatory postsynaptic potential (EPSP), the postsynaptic membrane would
most likely become permeable to: - ANS-Na+
During an inhibitory postsynaptic potential (IPSP), the postsynaptic membrane would
most likely become permeable to: - ANS-K+
(T/F) The autonomic branch of your nervous system controls elements of your person
that you cannot control and is further divided into the sympathetic and parasympathetic
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