Transcribed Image Text: 3. Red blood cells, which carry oxygen to body tissues, live for only about 120 days. Replacement cells are produced by cell division in bone marrow. How

Transcribed Image Text: 3. Red blood cells, which carry oxygen to body tissues, live
for only about 120 days. Replacement cells are produced
by cell division in bone marrow. How many cell divisions
must occur each second in your bone marrow just to
replace red blood cells? Here is the information to use in
calculating your answer: There are about 5 million red
blood cells per cubic millimetre (mm3) of blood. An
average adult has about 5 L (5,000 cm3) of blood. (nt:
is the total number of red blood cells in the body?
fraction of them must be replaced each day if all are
replaced in 120 days?)

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