If each human lung contains about 300 million alveoli with a summed total surface area for gas exchange of 40 square meters, what is the approximate surface area of a single alveolus?
A. 750 square micrometers
B. 133 square millimeters
C. 7.5 square micrometers
D. 7.5 square millimeters
E. 0.133 square micrometers
F. 1.33 square micrometers
Answer: E
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Cross-bridges form between the contractile proteins of the muscle cell. The movement of cross-bridges shortens the muscle fiber. What two proteins participate in cross-bridge formation?
A. actin and myosin B. troponin and titin C. titin and myosin D. titin and actin
Dietary treatment of galactosemia ____
a. need not begin until one or two months after birth b. consists of very low protein intake c. can usually be discontinued by the age of twelve d. completely eliminates symptoms of the disease e. should be started within a few days after birth
What is the specific location of a gene on a chromosome?
A. genotype B. allele C. phenotype D. locus
The carbonic acid and bicarbonate buffer in blood is extremely important to help maintain homeostasis. What would happen to the pH of the blood if bicarbonate were removed?
A. Removing bicarbonate from the blood would not affect the pH B. Removing bicarbonate from the blood would increase the pH C. Removing bicarbonate from the blood would decrease the pH