A heart valve opens and closes due to
a. being pulled by the heart muscle
b. pressure differences on the valve's two sides
c. Na+ and K+ fluxes during ventricular depolarization
d. turbulent flow in the atria and ventricles
e. none of the above
B
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Which of the following does not occur after menopause?
A) Menstrual cycles cease. B) Ovulation ceases. C) Estrogen levels rise. D) GnRH secretion increases. E) FSH secretion increases.
The thick and thin filaments are made up of ________, respectively
A) the dark and light bands B) the H zone and the Z disc C) T tubules and terminal cisterns D) myosin and actin
The period of the cell cycle when the cell grows and performs its metabolic activities is ________
A) anaphase B) interphase C) metaphase D) telophase
Which type of muscle tissue would cause flexion and extension of the arm?
A. skeletal muscle B. smooth muscle C. cardiac muscle