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1671. As in the arms and legs, blood flows against gravity and is prevented from flowing back by
A. the extremely low pressure of venous blood
B. valves
C. movements in the surrounding muscles
D. the narrowing down of the lumen of veins by the contraction of the muscle layer comprising their walls
Explanation:
1672. Rennin and lactase, the enzymes required to digest milk, disappear in the human body by the age of
A. two
B. three
C. five
D. eight
Explanation:
1673. Galvanised iron sheets have a coating of
A. tin
B. lead
C. zinc
D. chromium
Explanation:
1674. The pitch of the voice of women is generally
A. same as that of men
B. higher than that of men.
C. much lower than that of men
D. None of these
Explanation:
1675. Detection of Rh factor is an example of
A. enzymatic reaction
B. chemical reaction
C. phagocytic reaction
D. immunologic reaction
Explanation:
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