Red blood cells need to be replaced every ____. 

A. 10 to 20 days
B. 30 to 45 days
C. 60 to 90 days
D. 90 to 120 days
E. 120 to 150 days


D. 90 to 120 days
Red blood cells need replaces as often as every 90 to 120 days.

Health Professions

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Which of the following is NOT considered a means of ventilation?

A) Negative ventilation B) Positive-pressure ventilation C) Conventional ventilation D) Vacuum

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The statement "The breaths are pressure-limited, but the pressure limit can be adjusted between breaths to achieve a preset tidal volume" describes which of the following modes of ventilation?

a. Dual mode c. Adaptive mode b. Servo mode d. Knowledge-based mode

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Which portion of a muscle is fixed?

A) Origin B) Insertion C) Neither a nor b D) Both a and b

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The radiation that is least dangerous as a threat to external portions of the body but is very dangerous if ingested or inhaled is:

a. Alpha b. Ultra violet c. Electromagnetic d. Gamma

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