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In veins, valves are present to check ba...

In veins, valves are present to check backward flow of blood flowing at

A

high pressure

B

low pressure

C

atmospheric pressure

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
B
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Fill in the blanks of the following paragraph using just two words – arteries and veins ___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form __________ .

Assertion : There is no mixing of oxygenated and deoxygenated blood in the human heart. Reason : Valves are present in the heart which allows the movement of blood in one direction only.