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. (Hint: What is the total number of red blood cells in the body? What fraction of them must be replaced each day if all are replaced in 120 days?)
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. (Hint: What is the total number of red blood cells in the body? What fraction of them must be replaced each day if all are replaced in 120 days?)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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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. (Hint:
What is the total number of red blood cells in the body?
What fraction of them must be replaced each day if all are
replaced in 120 days?)
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