The cell type that is specialized to communicate with other cells and control their activities is
A. Epithelial cells
B. Muscle cells
C. Connective tissue cells
D. Nerve cells
D
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Proteins called ________ are channel proteins that allow the passage of metabolites between neighboring cells.
Fill in the blank(s) with the appropriate word(s).
Blood plasma is slightly _______; if pH drifts out of the normal range, dire consequences can result from alterations in the structure of _______
A. acidic, glucose B. acidic, proteins C. acidic, glycogen D. basic, glucose E. basic, proteins
Which organ functions to absorb significant quantities of water, electrolytes, and vitamins?
A) large intestine B) spleen C) pancreas D) stomach
The depressor anguli oris muscle
A. puckers the mouth for kissing. B. contributes to pouting. C. contributes to laughing and smiling. D. causes crow's feet wrinkles. E. raises the eyelid.