1. Which of the following statement is correct about human circulatory system?
a. Blood transport only O2 and not CO2
b. Human heart has five chambers.
c. Valves ensure that blood does not flow backward.
d. Both oxygenated and deoxygenated blood get mixed in heart
Answers
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c. Valves ensure that blood does not flow backward
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Answer: option C
Explanation.
Blood transports both O2 and CO2
Humar heart has 4 chambers
We have 2 circulations pulmonary and systemic which contains deoxygenated and oxygenated blood respectively and so both blood wont mix
Finally valves make sure blood flows unidirectionally
So answer is C
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