Natural body defenses that can prevent infectious diseases do NOT include:
A. tears.
B. the mucous membrane lining of the respiratory, reproductive, and genitourinary tracts.
C. white blood cells that destroy pathogenic microbes.
D. perspiration.
Answer: D
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Why does the initial rate of an enzymatic reaction eventually plateau at a maximal velocity even though the concentration of the substrate continues to be increased?
A) Enzymes are denatured following action on a substrate. B) High concentrations of substrate inhibit movement of the substrate to available enzymes. C) The enzyme available in the solution has been consumed. D) The enzyme is saturated and unable to bind substrate at a higher rate.
The structure containing a person's "voice box" is termed the:
A) pharynx. B) larynx. C) trachea. D) sternum.
Oxygen cylinders are typically filled to pressures equal to:
A) 2,000 pounds per square foot (psf). B) 3,000 pounds per square inch (psi). C) 3,000 pounds per square foot (psf). D) 2,000 pounds per square inch (psi).
The EMT should recognize a full-term pregnancy has occurred in which patient?
A) A 21-year-old woman who is 39 weeks pregnant and feeling dizzy B) A 40-year-old woman beginning her third trimester but whose water just broke C) A 25-year-old woman who is 220 days into pregnancy and complaining of back pain D) A 33-year-old woman who is pregnant with twins and in the eighth month of pregnancy