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Biologia : Sistema Circulatório



Seu desempenho  

1.

Which of these is not a feature of veins?

  They contain valves.

  All veins carry deoxygenated blood.

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

  They are thin-walled.

Dica      

2.

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

  True

  False

3.

Bleeding time is prolonged in hemophilia.

  False

  True

4.

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

  Fever

  Anxiety

  Exercise

  Sleep

Dica      

5.

Which of these is not true regarding hemoglobin?

  Percentage of hemoglobin in a healthy young man is 10 – 12 gm%.

  It is found in RBCs.

  It carries oxygen.

  Its deficiency leads to anemia.


 

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