Question

What is the time of rest in the heart?
A. Never
B. while sleeping
C. Between two beats
D. While doing yoga san

Answer 1

The heart is a muscular organ that pumps blood through the body, about the size of your fist. This system is a blood vessel network that carries blood to and from all parts of the body, such as arteries, veins, and capillaries.

Complete answer: An enormous cluster of cells called the sinoatrial node, about 8 mm long and 2 mm wide, is sitting on the upper right side of the heart. These 'pacemaker' cells keep sending out electrical impulses, more than once a second, to make the rest of the heart contract and pump out blood, unlike any other cell in the body.
These cells continue to function even after the heart is removed for transplantation from the body. All muscles need a constant supply of blood to provide them with fuel (oxygen and nutrients), and this is particularly true of the tireless heart that absorbs tremendous quantities of energy. The heart absorbs twenty times as much oxygen as a sleeping skeletal muscle, even while sleeping.
The heart has its special blood supply, known as the coronary circulation, which surrounds the heart, supplying all parts abundantly, with around one capillary for each cardiac cell, to satisfy this requirement. Remarkably, the blood vessels expand to bring more fuel in when the heart requires more oxygen, such as during exercise, stopping the heart from tiring out.
Below is the picture of the heart.

Hence the correct answer is option A, Never.

Note: Since it has more mitochondria than skeletal muscle, the cardiac muscle prevents fatigue so well. The core doesn't need to sit and hang out with so many power plants at its disposal. It also has a constant blood supply that gives it oxygen and nutrients.