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Biologia : Sistema Circulatório



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1.

Which of these does not cause an increase in pulse rate?

  Exercise

  Anxiety

  Fever

  Sleep

Dica      

2.

Due to presence of ______ , back flow of blood is prevented in veins.

  All of these

  Thick walls

  Valves

  Septa

3.

Very fine vessels called capillaries connect arteries and veins to each other.

  True

  False

4.

Which of these is not a feature of veins?

  They return blood from the various parts of the body to the heart.

  They contain valves.

  They are thin-walled.

  All veins carry deoxygenated blood.

Dica      

5.

Deficiency of hemoglobin is known as anemia.

  True

  False


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