Why does the upper third of the esophagus have skeletal muscle in its wall?
A. The first phase of swallowing is involuntary
B. So that peristalsis can occur
C. To prevent choking
D. The first phase of swallowing is voluntary
Answer: D
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The number of bones in the adult appendicular skeleton is
A. 80. B. 126. C. 206. D. 412.
If a person begins to sweat upon entering a hot room but continued sweating is able to keep the body temperature stable, which of these best describes her condition?
A. She is not using energy to maintain a constant temperature. B. She is using a positive feedback mechanism. C. She is in a steady state. D. Two of the choices are correct. E. She is in an equilibrium state.
Which of the labeled cells in the diagram is a neuroglial cell that forms and maintains the myelin sheath around CNS axons?
a) A b) B c) C d) D e) F
An agonist ________
A) opposes a specific action B) promotes or facilitates a specific action C) serves as the fixed attachment of a muscle D) is also known as a prime mover. Contraction results in a specific action