A __________ is a quick, involuntary, stereotyped reaction of glands or muscles to stimulation.
Fill in the blank(s) with the appropriate word(s).
reflex
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Secretes acid and enzymes. Mixes food with secretions to begin enzymatic digestion of proteins.
The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "D"?
A. Site of protein synthesis B. Contains digestive enzymes C. Directs cellular activities, contains DNA D. Major site of ATP synthesis when oxygen is available E. Outer boundary of cell, controls entry and exit of substances
Which of the following is not a function of the kidney?
A. Regulation of blood pressure B. Secretion of renin and erythropoietin C. Regulation of blood pH D. Regulation of water and electrolyte concentrations in the blood E. All of these are functions of the kidney.
Implantation usually begins at about the end of the first ________ of development.
A. week B. trimester C. day D. month