NEET UG 2019 — Body Fluids and Circulation

All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

A specialised nodal tissue embedded in the lower corner of the right atrium, close to atrio-ventricular septum, delays the spreading of impulses to heart apex for about $0.1 \mathrm{sec}$. The delay allows

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

Match the Column - I with Column - II: <table class="pyq-table"><tbody><tr><th></th><th>Column - I</th><th></th><th>Column II</th></tr><tr><td>$(a)$</td><td>P - wave</td><td>$(i)$</td><td>Depolarisation of ventricles</td></tr><tr><td>$(b)$</td><td>QRS complex</td><td>$(ii)$</td><td>Repolarisation of ventricles</td></tr><tr><td>$(c)$</td><td>T - wave</td><td>$(iii)$</td><td>Coronary ischemia</td></tr><tr><td>$(d)$</td><td>Reduction in the size of T - wave</td><td>$(iv)$</td><td>Depolarisation of atria</td></tr><tr><td></td><td></td><td>$(v)$</td><td>Repolarisation of atria</td></tr></tbody></table> Select the correct option