Which of the following statements concerning negative feedback is incorrect?
a. negative feedback exists when a change in a regulated variable triggers a response that opposes the change.
b. negative feedback exists when the input to a system increases the output and the output limits its own production by inhibiting the input.
c. with negative feedback, a control system's input and output continue to enhance each other.
d. most of the body's homeostatic control mechanisms operate on the principle of negative feedback.
e. it is the only mode of extrinsic control.
C
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Squamous cells are column-like.
Answer the following statement true (T) or false (F)
A viral disease that destroys the cells of the anterior gray horn will
A) lead to skeletal muscle weakness or paralysis. B) interfere with position sense. C) mainly interfere with crude touch and temperature sense. D) block autonomic regulation. E) affect visceral motor function.
Membrane protein pores that can be opened and closed are called ________ channels.
Fill in the blank(s) with the appropriate word(s).
Into what structures are the glucose and amino acids absorbed?
A) Simple cuboidal cells of the stomach B) Simple columnar cells of the stomach C) Simple columnar cells of the small intestines D) Lacteals of the small intestine villi