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Which is responsible for initiating and ...

Which is responsible for initiating and maintining the rhythmic contractile activity of the heart ?

A

Sino-atrial node (SAN)

B

Atrio-ventricular node (AVN)

C

Purkinje fibres

D

Bundle of his

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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

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.

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 : 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.

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

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

Which organ is responsible for activity and the hand-eye coordination in the human body ?

MOTION-BODY FLUIDS AND CIRCULATION-Exercise - 2 NCERT BASED QUESTIONS
  1. In which the following can increase the rate of heart beat ? (A) Sym...

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  2. During joint diastole :-

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  3. Which is responsible for initiating and maintining the rhythmic contra...

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  4. In which the following has the ability to generate action potential wi...

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  5. Which information is incorrect about cardiac output ?

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  6. Birds and Mammals have :-

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  7. Open circulatory system is present in :-

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  8. Identify the correct sequence of events in a cardiac cycle :-

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  9. During ventricular systole

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  10. The cardiac impulse is initiated and conducted further upto ventricle....

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  11. The second heart sound (dubb) is associated with the closure of

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  12. Match the terms given under Column 'A' with their functions given unde...

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  13. Cardiac activity could be moderated by the autonomous neural system. T...

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  14. Which among the following is correct during each cardiac cycle

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  15. Blood platelets are found only in the blood of

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  16. What is the main difference in human and frog RBCs?

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  17. Prothrombin is found in :-

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  18. Which type of WBCs are most abundant in the blood of rabbit and other ...

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  19. Blood clotting in a test tube can be prevented by adding a little of :

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  20. Oval, biconvex and nucleated RBC's are found in

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