Punjab 11th Class Biology Circulation Mcqs Test Online

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Question 1 of 13

Biology

1. Typical lub-dub sounds heard in heart in heartbeat are due to

Closing of semilunar valves

Closure of bicuspid –tricuspid valves followed by semilunar valves

Closing of bicuspid and tricuspid valves

Blood under pressure through aorta

Question 1 of 13

Question 2 of 13

2. The rhythmic beating of cardiac muscle in the mammalian heart is initiated by the:

Purkinje tissue

Parasympathetic nervous system

Atrio-ventricular node

Sino-atrial node

Question 2 of 13

Question 3 of 13

3. Bicuspid valve connects

Left atrium and right ventricle

Right atrium and left ventricle

Right atrium and right ventricle

Left atrium and left ventricle

Question 3 of 13

Question 4 of 13

4. The Sino Atrial node (SA node)

Is also called AV node

Is also called bundle of His

Regulates the rhythm of contraction

Regulates the rate of contraction

Question 4 of 13

Question 5 of 13

5. During ventricular systole in a mammalian heart the

Semilunar valves close

Ventricular pressure increases

Aortic pressure decreases

Atrioventrcular valves open

Question 5 of 13

Question 6 of 13

6. Lymph most closely resembles which of the following?

Interstitial fluid

Water

Blood

Urine

Question 6 of 13

Question 7 of 13

7. A red blood cell, entering the right side of the heart, passes by or through the following structures:
1. atrioventricular valve 2. Semilunar valve
3. Right atrium 4. Right ventricle
5. Sinoatrial node
In which order will the red blood cell passes the structures?

5 → 3 → 1 → 4 → 2

3 → 5 → 1 → 2 → 4

3 → 1 → 5 → 2 → 4

2 → 3 → 1 → 4 → 5

Question 7 of 13

Question 8 of 13

8. Which of these factors has little effect on blood flow in arteries?

Blood pressure

Total cross sectional area of vessels

Skeletal muscle contraction

Heartbeat

Question 8 of 13

Question 9 of 13

9. Pacemaker is situated in heart

In the wall of left atrium

In the wall of right atrium

On interauricular septum

On interventricular septum

Question 9 of 13

Question 10 of 13

10. What produces systolic blood pressure?

Contraction of the right ventricle

Contraction of the right atrium

Contraction of the left atrium

Contraction of the left ventricle

Question 10 of 13

Question 11 of 13

11. What effect would be caused by cutting the sympathetic nerve fibres to the heart?

A decrease in the length of the systole phase

A decrease in the length of the diastole phase

A decrease in the heartbeat rate

A decrease in the stroke volume

Question 11 of 13

Question 12 of 13

12. Human heart is

Myogenic

Neurogenic

Cardiogenic

Digenic

Question 12 of 13

Question 13 of 13

13. Lymph returns …………… to blood

White blood cells

Carbon dioxide

Oxygen

Interstitial fluid

Question 13 of 13

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