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A patch of nodal tissue responsible for ...

A patch of nodal tissue responsible for initiating the rhythmic contractile activity of heart is present in

A

Lower left corner of the left ventricle

B

Upper right corner of the right atrium

C

Lower left corner of the right ventricle

D

Upper left corner of the left atrium

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The correct Answer is:
B
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Which is responsible for initiating and maintining the rhythmic contractile activity of the heart ?

Which of the following statements are correct about Sino-atrial node A) It is responsible for initiating and maintaining the rhythmic contractile activity of the heart B) It is auto-excitable and generates 70 - 75 action potentials per minute C) It sets the pace of the activities of the heart and is called pacemaker

a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart during a cardiac cycle. c. The cardiac output of a normal man will be much lesser than an athlete. d. The wall of right ventricle is much thicker than the left ventricle e. In pisces the two separate circulatory pathways are present, hence they have double circulation. f. The clsoed circulatory pattern is considered to be more advantageous than open circulatory pattern. g. Glucose is absorbed by simple diffusion through lymph in lacteales present in the intestinal villi. h. The SAN can generate the maximum number of action potential i.e. 140-150 mi n^(-1) in neonates, and is responsible for initiation and maintenance of the rhythmic contractile activity of the heart. i. Angina can occur in any age but more common among the neonates and infants. j. heart failure is sometimes called congestive heart failure because congestion of the blood vessels is one of the main symptoms of this disease.

Assertion : The sino-atrial node (SAN) is called the pacemaker. Reason : SAN is responsible for initiating and maintaining the rhythmic contractile activity of the heart.

Assertion : Sino-atrial node (SAN) is called the pacemaker Reason : SAN generates the maximum number of action potentials and is responsible for intiating and maintaining the rhythmic contractions of the heart.

What are nodal tissues? How they regulate the initiation of heartbeat ?

Answere the following name the major site where RBCs are formed which part of heart is responsible fpr initating and maintaining its rhythmic activity ?

AAKASH INSTITUTE-BODY FLUIDS AND CIRCULATION-Assignment Section - B Objective Type Questions
  1. Read the following : a. Lymph absorbs and transports fat from the in...

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  2. Blood pumped by the heart passes into sinuses in

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  3. A patch of nodal tissue responsible for initiating the rhythmic contra...

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  4. Murmur occurs due to defect in

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  5. Repolarisation of the ventricles is represented by

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  6. The strength of ventricular contraction increases when SAN is stimulat...

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  7. Match I with column II {:("Column "I, "Column "II), (a. " Capillarie...

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  8. Complete stoppage of heart beat is known as

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  9. Which of the following diseases is also known as artherosclerosis ?

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  10. There is no capillary system in case of most of the invertebrates exce...

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  11. Time interval between the closure of semilunar valve and closure of AV...

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  12. If one litre of blood is drawn out of 5 litres from the body of man, h...

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  13. RBC placed in distilled wate will

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  14. Universal recipient blood group :-

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  15. A person with antigen A in the RBC and antibody B in plasma belongs to...

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  16. The two aurticles are demarcated extrenally from the ventricle by an i...

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  17. The opening of pulmonary vein is without valve because

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  18. A cardiac cycle invloves

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  19. The duration of the ventricular diastole in a normal cardiac cycle is

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  20. The course of blood from the heart to the lungs and back to the heart ...

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