Biopsychology multiple choice help, PLEASE!?

Posted on 2015-10-09 06:05:00 in Biology by AMANDA

Please help me with the biopsychology multiple choice questions.

1. Astrocytes
a. are long relative to their diameter and cell body size.
b. Have 2 modes of growth
c. are formed from cylinders produced by Schwann cells
d. will divide and make new cells if a lot of brain tissue is injured.

2. The rate at which a neuron sends a message depends on the number of:
a. boutons in the nearby interneurons
b.excitatory and inhibitory signals it receives
c. synapses surrounding the synaptic cleft
d. axons serving in a muscle, in a motor neuron
e. the amount of microtubules it contains.

3. Where can sodium ions enter a myelinated axon during the Action potential?
a. at the soma
b. through the myelin sheath
d. at the point at which the axon divides and branches
d. at the receptor sites on the postsynaptic membrane (my guess)

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