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The action potential is conducted to the...

The action potential is conducted to the ventricles by AVN (Atrioventricular node) damage to AVN results in

A

Tachycardia

B

Heart block / Ventricular escape

C

Atherosclerosis

D

Congestive heart failure

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Read the following statements : A. The action potential generated by the SA node stimulates both ventricles to undergo simultaneous contraction. B. The heart sound Lubb is associated with the closure of both semilunar valves. C. The QRS complex in ECG represents the depolarization of the ventricles. Select the appropriate option from the following :

Identify the correct sequence of the cardiac cycle. (i) Blood through the pulmonary vein and vena cava enters in left and right atria respectively. (ii) AVN generates action potential for the ventricles. (iii) SAN bring about atrial systole . (iv) Ventricular systole pushes blood away from the heart .

Which of the following events do not occur during joint diastole ? (A) All four chamber of heart are in relaxed state (B) Atrial repolarization valve open (C ) Action potential is conducted from SAN to AVN (D) Blood from the pulmonary veins and vena cava flows into the left and right ventricles respectively through the left and right atria (E ) The semilunar valves are closed

Number of action potentials that can be generated by sino-atrial node is

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.

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 ?

Which of the following statements about conducting system of the heart is INCORRECT ? I. Mass of nodal tissue seen in the lower-left corner of the right atrium is the sinoatrial node. II. The nodal musculature can generate action potentials only in response to external stimuli . III. The number of action potential that could be generated in a minute varies at different parts of the nodal system . IV. The SAN can generate the maximum number of action potential , i.e., 80-85 min^(-1)

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 parts from where deoxygenated blood is returned to the heart. (ii) The openings of the right and the left ventricle 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 represents depolarisation of the ventricles. Which of the above four statements are incorrect?

mark the true and false statements 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.

A conducting wire of length l, lying normal to a magnetic field B, moves with a velocity v as shown in (a) Find the average magnetic fore on a free electron of the wire. Due to this magnetic force, electrons concentrate at one end resulting in an electric field inside the wire. The redistribution stops when the electric force on the free electrons balances themagnetic force. Find the electric field developed inside the wire when the redistribution field developed inside the wire when the redistribution stops. (c) what potential difference is developed between the ends of the wire?

AAKASH INSTITUTE ENGLISH-TEST 5-EXAMPLE
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  3. Which of the given sets of elements is present in plant tissue in exce...

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  4. Sulphur is not a component of

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  5. Select the mismatched pair

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  6. Identify the element on the basis of given statements a. Its deficency...

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  7. Chosse the odd one w.r.t the elements which help in maintainig cation-...

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  8. Toxicity of manganese in a plant result in a. Brown spot surrounded by...

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  9. Movement of ions into symplast area of a plant cell

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  10. 2NH3 + 3O2 2NO2- + 2H+ + 2H2O The organism responsible for th...

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  11. Enzyme nitrogenese will be absent in

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  12. The region of nodule where Rhizobium is active lacks

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  13. Read the following statements and mark them as True (T) or False (F) A...

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  14. A + NH 4 + B rightarrow C -Glutamate + H2O + D complete the above ...

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  15. Read the following statements and choose the correct option A: Aspara...

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  16. Mark the odd statement for ureides

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  17. Which of the following is not a benefit of hydroponics

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  18. Defeciency of which element is not responsible for death of leaf tissu...

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  19. Mark the incorrect match.

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  20. Elements found in ferredoxin are

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  21. Chlorophyll synthesis will be largely affected due to deficiency of wh...

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