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.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.