Punjab 11th Class Biology Circulation Mcqs Test Online

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Question 1 of 13

Biology

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

Sino-atrial node

Parasympathetic nervous system

Purkinje tissue

Atrio-ventricular node

Question 1 of 13

Question 2 of 13

2. Pacemaker is situated in heart

In the wall of right atrium

On interventricular septum

On interauricular septum

In the wall of left atrium

Question 2 of 13

Question 3 of 13

3. During ventricular systole in a mammalian heart the

Aortic pressure decreases

Semilunar valves close

Ventricular pressure increases

Atrioventrcular valves open

Question 3 of 13

Question 4 of 13

4. Human heart is

Cardiogenic

Myogenic

Digenic

Neurogenic

Question 4 of 13

Question 5 of 13

5. 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

Blood under pressure through aorta

Closing of bicuspid and tricuspid valves

Question 5 of 13

Question 6 of 13

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

Total cross sectional area of vessels

Heartbeat

Skeletal muscle contraction

Blood pressure

Question 6 of 13

Question 7 of 13

7. What produces systolic blood pressure?

Contraction of the right ventricle

Contraction of the left atrium

Contraction of the left ventricle

Contraction of the right atrium

Question 7 of 13

Question 8 of 13

8. Lymph returns …………… to blood

White blood cells

Oxygen

Interstitial fluid

Carbon dioxide

Question 8 of 13

Question 9 of 13

9. 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 9 of 13

Question 10 of 13

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

A decrease in the stroke volume

A decrease in the heartbeat rate

A decrease in the length of the systole phase

A decrease in the length of the diastole phase

Question 10 of 13

Question 11 of 13

11. Lymph most closely resembles which of the following?

Interstitial fluid

Urine

Blood

Water

Question 11 of 13

Question 12 of 13

12. The Sino Atrial node (SA node)

Regulates the rhythm of contraction

Regulates the rate of contraction

Is also called bundle of His

Is also called AV node

Question 12 of 13

Question 13 of 13

13. Bicuspid valve connects

Left atrium and right ventricle

Right atrium and left ventricle

Left atrium and left ventricle

Right atrium and right ventricle

Question 13 of 13

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