The number of action potential generated by SAN:
(1) 70–75 times per minute.
(2) 50–72 times per minute.
(3) Exact 70 times per minute.
(4) not more than 60 times per minute.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology'Bundle of His' is a part of which one of the following organs in humans?
1. Heart
2. Kidney
3. Pancreas
4. Brain
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySAN is responsible for
(1) initiating and maintaining a random contractile ability of heart
(2) initiating and maintaining a rhythmic contractile ability of heart
(3) maintaining a random contractile ability of heart
(4) Initiating a rhythmic contractile ability of heart
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat does the depolarization of ventricles initiate?
(1) Atrial Diastole
(2) Atrial systole
(3) ventricular systole
(4) Joint Diastole
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following sequences best represents the pathway of an action potential through the Heart's conduction system?
(i) Sino-atrial (SA) node
(ii) Purkinje fibres
(iii) Bundle of His
(iv) Atrio-ventricular (AV) node
(v) Right and left bundle branches
1. (i),(iv),(iii),(ii),(v)
2. (iv), (i),(iii),(v),(ii)
3. (iii),(iv),(i),(ii),(v)
4. (i),(iv),(iii),(v),(ii)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyNormal activities of the human heart are regulated:
1. Intrinsically
2. By the autonomic nervous system
3. By the brain stem
4. By the diencephalon
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich one of the following is wrong with respect to nodal tissue.
(1) auto excitable
(2) not localized to a single chamber.
(3) equal ability to excite throughout nodal tissue.
(4) structural changes are observed throughout nodal musculature in different chambers of the heart.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe action potential of ventricular side and to the entire ventricular musculature is conducted by–
(1) AVN, AV bundle and Bundle of His
(2) SAN, AVN, AV bundle and Bundle of His
(3) SAN, AV bundle and Bundle of His
(4) Only by Bundle of His
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDepolarisation and repolarisation actually initiate ___________ in different chambers of heart?
(1) contraction and relaxation
(2) relaxation and contraction
(3) thickening and thinning
(4) thinning and thickening
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe action potential causes ______ and then the ______ to undergo ______ followed by ______.
(1) ventricles, atria, contraction, relaxation
(2) atria, ventricles, contraction, relaxation
(3) ventricles, atria, relaxation, contraction
(4) atria, ventricles, relaxation, contraction
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology