Reference no: EM132280175

(Biopsych)

1. What physical thing actually travels down the axon during an action potential? Explain.
2. How does myelin increase the conduction speed of axons? NOTE: The word "jump" does not appear in the answer.
3. Describe excitatory synaptic transmission from the arrival of the action potential to the clean up of the neurotransmitter.
4. Why are there many levels of control in the brain for vital functions like eating and sex?
5. Why are there 12 cranial nerves going in and out of the brain? Give an answer based on evolution. Note: there are 2 pairs for each spinal cord segment.
6. In the wild most animals have good eyesight. Many humans have poor eyesight. Assuming that poor eyesight is caused by genes, give a natural selection explanation for the difference (increased percentage of humans with poor eyesight). Count genes.