What is a sesamoid bone?
A. A bone growing within some cartilages in response to pressure
B. A bone that forms within some tendons in response to stress
C. A bone that forms in the cranium in response to trauma
D. A bone made of hyaline cartilage
E. A bone made of dense regular connective tissue
B. A bone that forms within some tendons in response to stress
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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+.
The reference position for all body directional terms is the:
a. anatomical position b. prone position c. supine position d. sitting position
Which of the following bones contains the cribriform plate, which is involved in olfaction (smell), and the perpendicular plate, which forms the majority of the nasal septum?
A. Ethmoid bone B. Nasal bone C. Vomer bone D. Sphenoid bone E. Inferior nasal concha
The external genitalia do not become clearly differentiated until about week ________ of development.
A. 6 B. 12 C. 20 D. 38 E. 32