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Arteries do not have valves but veins do, because :

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Important Questions on Body Fluids and Circulation

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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 110
One difference between blood and lymph is that
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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 111
Saturated dietary fats increase the risk of heart disease by
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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 112
An individual has O blood group if his/her blood sample.
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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 113

Although blood flows through large arteries at high pressure, the pressure decreases when it reaches small capillaries

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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 114
The fluid part of blood flows in and out of capillaries in tissues to exchange nutrients and waste materials. Under which of the following conditions will fluid flow out from the capillaries into the surrounding tissue?
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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 115
The heart of an amphibian is usually
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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 116
A smear of blood from a healthy individual is stained with a nuclear stain called hematoxylin and then observed under a light microscope. Which of the following cell type would be highest in number?
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Alpha Question Bank for Medical: Biology>Chapter 18 - Body Fluids and Circulation>Exercise-3>Q 117
A person with blood group “A” can (a) donate blood to, and (b) receive blood from,