A degeneration of dopamine-producing neurons in the substantia nigra results in
A) senility.
B) dementia.
C) Parkinson disease.
D) Alzheimer disease.
Ans: C) Parkinson disease.
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This figure shows the knee joint. Which number indicates the tibial collateral ligament?
A. 1 B. 2 C. 3 D. 5 E. 6
Exchange between a blood vessel and the cells that surround it can occur only in
A) arteries. B) arterioles. C) veins. D) venules. E) capillaries.
The absolute refractory period ends when
A. inactivation gates of voltage-gated Na+ ion channels reopen. B. activation gates of voltage-gates Na+ ion channels reopen. C. the sodium-potassium exchange pump stops. D. voltage-gated K+ channels open. E. None of these choices is correct.
If neither testosterone nor mullerian-inhibiting hormone is secreted during embryonic development
A. the paramesonephric duct system degenerates. B. the mesonephric duct system is stimulated. C. internally female reproductive structures form. D. the individual appears as a male. E. internally male reproductive structures form.