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HEART BEAT: While pumping the blood, different chambers of the heart contract and
relax in turns.

 The contraction and relaxation of different chambers produce a thumping sound.
This sound can be heard as heartbeat.
 One heartbeat indicates one cycle of pumping action by all the four chambers. The
heart of a normal human beats for 72 times in a minute.
 The heart pumps about 70 mL blood in one beat. This means that heart pumps a
whopping 5 litre blood in a minute.

PULSE: At certain locations in the body, a pulse; similar to heartbeat; can be felt.

 This happens because of blood rushing into arteries with every heartbeat.
 The throbbing sensation is called pulse.
 The pulse rate is same as the heart rate. Pulse can be felt near the wrist, neck,
ankle, etc.

STETHOSCOPE: This is a device which is used by doctors to listen to the heartbeat and
pulse.

 Stethoscope is composed of a long rubber tube, two ear-pieces and a diaphragm.