Punjab 11th Class Biology Circulation Mcqs Test Online

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Question 1 of 13

Biology

1. Lymph returns …………… to blood

Interstitial fluid

Carbon dioxide

Oxygen

White blood cells

Question 1 of 13

Question 2 of 13

2. 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

2 → 3 → 1 → 4 → 5

3 → 1 → 5 → 2 → 4

3 → 5 → 1 → 2 → 4

Question 2 of 13

Question 3 of 13

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

Skeletal muscle contraction

Total cross sectional area of vessels

Heartbeat

Blood pressure

Question 3 of 13

Question 4 of 13

4. Bicuspid valve connects

Left atrium and left ventricle

Left atrium and right ventricle

Right atrium and left ventricle

Right atrium and right ventricle

Question 4 of 13

Question 5 of 13

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

A decrease in the length of the diastole phase

A decrease in the stroke volume

A decrease in the heartbeat rate

A decrease in the length of the systole phase

Question 5 of 13

Question 6 of 13

6. Lymph most closely resembles which of the following?

Interstitial fluid

Urine

Water

Blood

Question 6 of 13

Question 7 of 13

7. The Sino Atrial node (SA node)

Regulates the rhythm of contraction

Is also called bundle of His

Is also called AV node

Regulates the rate of contraction

Question 7 of 13

Question 8 of 13

8. Pacemaker is situated in heart

In the wall of right atrium

In the wall of left atrium

On interventricular septum

On interauricular septum

Question 8 of 13

Question 9 of 13

9. Human heart is

Cardiogenic

Digenic

Myogenic

Neurogenic

Question 9 of 13

Question 10 of 13

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

Parasympathetic nervous system

Purkinje tissue

Atrio-ventricular node

Sino-atrial node

Question 10 of 13

Question 11 of 13

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

Closing of bicuspid and tricuspid valves

Closing of semilunar valves

Closure of bicuspid –tricuspid valves followed by semilunar valves

Blood under pressure through aorta

Question 11 of 13

Question 12 of 13

12. What produces systolic blood pressure?

Contraction of the left atrium

Contraction of the right ventricle

Contraction of the left ventricle

Contraction of the right atrium

Question 12 of 13

Question 13 of 13

13. During ventricular systole in a mammalian heart the

Ventricular pressure increases

Aortic pressure decreases

Atrioventrcular valves open

Semilunar valves close

Question 13 of 13

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