For muscle contraction to occur, ATP and its hydrolyzed forms are needed for the ________.
A. pumping of Ca2+ back into the sarcoplasmic reticulum
B. release of myosin cross bridges from actin
C. attachment of myosin cross bridges to actin
D. All of the choices are correct.
Answer: D
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T lymphocytes are responsible for
A) cell-mediated immunity. B) producing antibodies. C) humoral immunity. D) programming macrophages.
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Which cavity contains the bladder, some reproductive organs, and the rectum?
What will be an ideal response?