Physics, asked by wwwbharanimedical, 1 year ago

To pump blood by a normal heart once how many joules of energy are required

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Answered by arya790
2
The human heart is a pump that is made of muscle tissue. It has four chambers: the right atrium and the left atrium, which are located at the top, and the right ventricle and left ventricle, which are located at the bottom. A special group of cells called the sinus node is located in the right atrium. The sinus node generates electrical stimuli that make the heart contract and pump out blood. Each contraction represents a heartbeat. When the heart contracts it is in a systolic phase and when it rests it is in a diastolic phase. It takes blood about a minute to circulate through the cardiovascular system and pump oxygenated blood throughout the body.

The power of the heart can be calculated by multiplying the pressure by the flow rate. An average person has six liters of blood that circulates every minute, making the flow rate 10−4 m3/s (cubic meters per second). The pressure of the heart is about 104 pascal, making the heart's power about one watt. This is the power of a typical human heart, but it's different for everyone.

The average heart beats about 75 times per minute, which is about five liters of blood per minute. Although this isn't much, it enables the heart to complete a tremendous amount of work in a person's lifetime. The human heart beats about 40 million times a year, which adds up to more than 2.5 billion times in a 70-year lifetime. This results in approximately 2 to 3 billion joules of work in a lifetime, which is a huge amount.

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