Multiple choice and needs to be backed up with factual information on why you chose the answer. I will not choose

you as a best answer if you do not provide all information asked. PLEASE NO *WORKING ON YOUR ANSWER* REPLIES I WILL REPORT THEM*. 

1. Peristalsis in the small intestine begins

a. When CCK is released

b. When chyme enters the duodenum

c. When most nutrients have been absorbed 

d. With cephalic phase of stomach activity 

2. Protective collections of lymphocytes and macrophages occur in?

a. the gastric pits

b. the intestinal crypts

c. the peyers patches

d. the muscularis externa

3. A component of the electron transports system is?

a. iron

b. magnesium

c. cobalt

d. zinc

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