Which of the following events occurs last?
A. IP3 stimulates Ca2+ release from the endoplasmic reticulum.
B. Ca2+ binds with calmodulin.
C. IP3 (inositol triphosphate) is produced.
D. Epinephrine combines with membrane-bound receptor on smooth muscle cell.
E. Calmodulin binds to the enzyme that phosphorylates myosin and cross-bridges form.
Answer: E
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The reproductive cells are called ________
A) Gametes B) Sperm C) Ova D) All of the above
What does the “principle of complementarity of structures and function” mean?
Fill in the blank(s) with the appropriate word(s).
The acrosome contains enzymes used to __________.
A. dissolve the mucosa of the vagina B. dissolve the mucosa of the uterus C. dissolve the stickiness of the semen D. penetrate the vagina E. penetrate barriers surrounding the ovum
What part of the microscope is mounted on the nosepiece?
A) objective lenses B) focus knobs C) condenser D) iris diaphragm