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In which the following has the ability t...

In which the following has the ability to generate action potential without any external stimuli ?

A

Sino-atrial node (SAN)

B

Atrio-ventricular node (AVN)

C

Purkinje fibres

D

All of the above

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The correct Answer is:
D
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Read the following statements carefully (i) In fishes, the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body part from where deoxygenated blood is returned to the heart (ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves (iii) The nodal musculature has the ability to generate action potential without any external stimuli, i,e., it is autoexcitable (iv) The T-wave of ECG represent depolarisation of the ventricles. Which of the above two statements are incorrect ?

Assertion: The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is auto-excitable. Reason: The number of action potentials that could be generated in a minute very at different parts of the nodal system.

Read the following statements (i) The nodal musculature of the heart has the ability to generate action potentials without any external stimuli. (ii) The AV node is located in the right ventricle close to the AV septum (iii) The stroke volume is the amount of blood pumped out by each ventricle per minute. Which of these are correct ?

Read the following statements about the internal structure of the human heart. I. Humans have a an auto - excitable , chambered , muscular and myogenic heat. II. The heart is mesodermal in origin and is present symmetrically between two lungs in the thoracic cavity. III. The opening between the right atrium and left ventricle is guarded by a tricuspid valve. IV. Only th sino - atrial node of the heart has hte ability to generate action potentials without any external stimuli. How many statement/s is/ are incorrect from the above ?

Read the following statements and select the correct ones (i) Nodal tissue is specialised cardiac musculature in human heart which has the ability to generate action potential due to an external stimuli (ii) Position of SAN - right corner of right atrium (iii) Position of AVN - right corner of ventricle (iv) AV bundle continues from AVN (v) Purkinje fibres are modified cardiac muscle fibres that originate from the atrioventricular node and spread into the two ventricles.

MOTION-BODY FLUIDS AND CIRCULATION-Exercise - 2 NCERT BASED QUESTIONS
  1. During joint diastole :-

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

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

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  4. Which information is incorrect about cardiac output ?

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  5. Birds and Mammals have :-

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  6. Open circulatory system is present in :-

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

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  8. During ventricular systole

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

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

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

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

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

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  14. Blood platelets are found only in the blood of

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

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  16. Prothrombin is found in :-

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

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

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

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  20. Which of the following is an anticoagulant and checks blood coagulatio...

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