Home
Class 12
BIOLOGY
P wave of ECG indicates 1. activation ...

P wave of ECG indicates
1. activation of SA node
2. depolarization of atrial muslces
3. spread of excitation froom AV node ot Purkinje fibres
4. repolarization of atria and depolarization of ventricles

A

I and II

B

II and IV

C

I and III

D

I,II and III

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • BODY FLUID AND CIRCULATION

    ARIHANT NEET|Exercise MATCH THE COLUMNS|1 Videos

  • BODY FLUID AND CIRCULATION

    ARIHANT NEET|Exercise ASSERTION AND REASON|7 Videos

  • BODY FLUID AND CIRCULATION

    ARIHANT NEET|Exercise CHAPTER EXERCISES A TAKING IT TOGETHER|78 Videos

  • BIOTECHNOLOGY AND ITS APPLICATIONS

    ARIHANT NEET|Exercise CHAPTER EXERCISES ((C ) MEDICAL ENTRANCES GALLERY )|46 Videos

  • BREATHING AND EXCHANGE OF GASES

    ARIHANT NEET|Exercise Chapter exercise C (Medical entrances gallery )|54 Videos

Similar Questions

Explore conceptually related problems

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.

Match the Column - I with Column - II {:("Column-I",,"Column-II"),("(a) P-wave",,"(i) Depolarization of ventricles"),("(b) QRS complex",,"(ii) Repolarization of ventricles"),("(c) T-Wave",,"(iii) Coronary ischemia"),("(d) Reduction in the size of T-wave",,"(iv) Depolarization of atria"),(,,"(v) Repolarization of atria"):} Select the correct option:

A : The cardiac impulse which originates from SA node in mammalian heart cannot spread directly from atria to ventricles R : In mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.

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 :

Given these structures of the conduction system of the heart 1. Bundles of His 2. AV node 3. Bundle branches 4. Purkinje fibres 5. SA node Choose the arrangement that lists the structures in an order of an action potential passes through them.

Go through the following statements (i) Vagus nerve decreases the rate of impulse formation from the SA node and its conduction (ii) As the human heart is myogenic in nature, the rate of formation and conduction of cariac impulse cannot be changed by the action of nerves (iii) The end of T-wave in ECG marks the end of systole. (iv) If the P-wave in ECG is inverted , it indicates that SA node fails to initiate impulse and the atrial muscle depolarises by the impulse originating in A.V. node. Whic of these are correct ?

Statement 1: Atria receive blood from all parts of the body which subsequently flows to ventricles. Statement 2: Action potential generated at sino-atrial node passes from atria to ventricles.

Read the following statements and choose the correct option Statement 1 : Atria receive blood from all parts of the body which subsequently flows to ventricles. Statement 2 : Action potential generated at sino-atrial node passes from atria to ventricles.