For gas exchange to be efficient, the respiratory membrane must be
a. between 5 and 6 micrometers thick.
b. at least 3 micrometers thick.
c. 0.5 to 1 micrometer thick.
d. the thickness of the respiratory membrane is not important in the efficiency of gas exchange. 4 points

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Can you tell the size of a woman's coxal bone by observation?

Mary is 14 year old her resting heart rate is 70 beats per minute. calculate 50% of mary's maximum heart rate to fine her target heart rate