G cells of the stomach secrete
A) cholecystokinin.
B) secretin.
C) gastrin.
D) enteropeptidase.
E) pepsin.
Question 2
The humoral control of hormone release may be triggered which of the following factors?
A) blood level of an ion like calcium
B) blood level of a pituitary hormone
C) blood level of a hypothalamic hormone
D) nervous stimuli
E) neurotransmitter activation