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(d) Differences between $\mathrm{P}$-wave and $\mathrm{W}$-wave

S. No.	P-wave	W-wave
1.	P-wave indicates the impulse of contraction generated by sinu-auricular node of the right auricle.	T-wave represents the relaxation of ventricles.

Q. 4. Give reaso (a) Wall of the I Q. 2. Draw a Unit of ECG and explain its various segments. (NCERT) Ans. Electrocardiogram (ECG) : A graphic record of the electrical variations produced by the beating of the heart is called electrocardiograph. These variations are due to the development of electrical negativity of excited museles as compared with unexcited tissues. An instrument used to observe the working of the heart is called electrocardiogram. It was discovered by Einthoven (1906). ECG is formed by a series of ridges and furrows. Normal pattem of ECG for a healthy person is given below. In this, ' $P$ ' wave indicates the impulse of contraction generated by S.A. node. ' $\mathrm{QRS}$ ' wave indicates the spread of impulse of contraction from A.V. node to the wall of ventricles, whereas the ' $\mathrm{T}$ ' wave represents the relaxation of ventrivaxtricle. (b) Wall of the l cles. Fig. An Electrocardiograph. (c) Lymph cont: (d) Closed circui (e) During systo Ans. (a) Wall c Xight ventricle : Righ antery less pressure is Iemic aoria more pres Wicker than that of rig (b) Wall of the retponsible for the 51 thus more pressure is Therefore left ventri Any abnormality in the working of the heart changes the wave pattern of ECG and can be interpreted by a trained physician to diagnose a particular disorder. The technique to detect the abnormalities of the heart with the help of ECG is called electrocardiography.

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Updated on: Dec 5, 2022