For unlimited access to Homework Help, a Homework+ subscription is required.
Describe the major mechanisms for stimulation of gastric acid secretion and inhibition in cephalic, gastric and intestinal phases.
a. Give a brief definition of EGF-R's function.
b. Indicate whether it would function as an oncogene or tumor suppressor in cancer and a brief explanation.
c. List two possible ways the protein (gene) is altered such that its becomes oncogenic or is inactivated as a tumor suppressor. These should be based on what is known about the gene.
Answer the following and give a brief explanation for each:
A. Explain why potassium concentration is very important for neurone cell function.
B. What are the major molecular events that allow the transition between the relative refractory period and the absolute refractory period?
C. Where in the neurone would you fine the voltage gated channels?
D. What are the factors involved in maintaining and establishing the resting membrane potential in neurones?
E. Draw and label a recording (or a model) of an action potential - make sure to include all the different phases of the action potential and indicate which ion gates/channels are open and closed at each stage.