What hormones enhance the work of the heart?

The heart cannot speed up the work at our will. This is due to the fact that the nervous system does not send contraction commands to the muscle. The heart itself creates impulses. But still, it often speeds up. This happens under the influence of hormones. When we are afraid or worried, the adrenal glands release adrenaline and norepinephrine. They are very similar hormones in structure and function. They make the heart beat faster. Doctors use adrenaline to resuscitate a person, when it is necessary to start the heart, or rather return it to its normal rhythm.