The blood is able to flow in the blood vessels due to the pumping of a four-chambered muscular organ called heart.
It pumps blood to all parts of the body.
It is able to do so by the rhythmic contractions and relaxations of its muscles. These are known as the heart beats.
A normal heart beats about 60 to 80 times a minute.
We can hear our heart beat with the help of an instrument called a stethoscope.
Stethoscope
As the heart beats and forces blood through our body, we would feel a throbbing sensation at any point where an artery comes close to the surface of our skin, such as the wrist, neck, or upper arm. This throbbing sensation is called the pulse.
Counting the pulse rate is a simple way to estimate how fast our heart is beating. The four chambers of the heart are:
