Q2 of 95 Page 94

When are the sounds "LUBB" and "DUP" produced respectively during heart beat?

The sound "LUBB" is produced when the tricuspid & bicuspid valve (present at the at riot ventricular aperture) close with a jerk. The sound "DUP" is produced when the semilunar valves get closed.

Tricuspid valve is also called right at right atrio-ventricular valve & is located at the aperture between the right auricle & the right ventricle. It has three triangular leaf-like flaps.


Bicuspid valve is also called left atrio-ventricular valve & is located at the aperture between left auricle & left ventricle. It has two cusps.


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Give a reason, why a matured mammalian erythrocyte lacks nucleus and mitochondria?

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What does the term "double circulation" mean?

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Why do people have a common belief that the heart is located on the left side of the chest?

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Differentiate between members of each of the following pairs with reference to the aspect asked within brackets:

(a) Erythrocytes and leucocytes (function)


(b) Artery and vein (direction of blood flow)


(c) Artery and vein (type of blood primarily flowing through)


(d) Tricuspid and bicuspid valves (location).