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Fundamental Organisation Human Physiology Circulation - Questions and Answers

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1. How many pulmonary veins open into the left atrium
A. Only one
B. Two
C. Three
D. Four
Explanation:
2. The mature RBC do not contain the
A. Cytoplasm
B. Nucleus
C. Mitochondria
D. Plasma membrane
Explanation:
3. Heart is innervated by the
A. Vagus nerves
B. Sympathetic nerves
C. Parasympathetic nerves
D. Both 1 and 2
Explanation:
4. Which of the following is situated in the right atrium close to the opening of coronary sinus
A. S.A. node
B. A.V. node
C. Bundle of His
D. Purkinje fibres
Explanation:
5. The first sound ‘lub’ in the heart beat is caused by the closure of
A. Auriculo ventricular valve
B. Semi-lunar valve
C. Bicuspid valve
D. Tricuspid valve
Explanation:
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