Specialized pancreatic cells produce insulin. How do you think the cells secrete this product so that it can be used throughout the body?
A. Phagocytosis
B. Pinocytosis
C. Endocytosis
D. Exocytosis
E. Osmosis
D. Exocytosis
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Before birth, the uterus contains primary germ cells called ________.
Fill in the blank(s) with the appropriate word(s).
What mechanism causes the voltage-gated Na+ channels to close during an action potential?
A) The activation gate is voltage sensitive and closes close to the equilibrium potential for Na+. B) The activation gate is sensitive to K+ and closes when its intracellular concentrations drop. C) The inactivation gate has a time-dependent closure. D) The inactivation gate is voltage sensitive and closes close to the equilibrium potential for Na+.
Which of the following is an extension of the pia mater?
a. denticulate ligaments b. filium terminal c. spinal roots d. a and b
A positive feedback system regulates testosterone production.
Answer the following statement true (T) or false (F)