When a staff member asks how erythrocytes can carry oxygen, the nurse should describe which of the following properties that allow erythrocytes to function as gas carriers? (select all that ap-ply)
a. Biconcavity
b. Reversible deformability
c. Undergoes mitotic division
d. Presence of many mitochondria
e. Presence of a nucleus
ANS: A, B
Erythrocytes are small disks that are biconcave in shape and have the capacity to be reversibly deformed. They cannot undergo mitotic division and do not have many mitochondria. Erythro-cytes do not have a nucleus.
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You are attempting to increase your cardiovascular endurance in an effort to better perform your job as an EMT. Which of the following would be most appropriate in working toward this goal?
A) Increasing sleep to 8 to 10 hours a day B) Weight lifting with attention to the upper body C) Walking on a treadmill 3 to 4 times a week D) Stretching exercises every 4 hours while awake