How the Heart Adjusts Its Beat

Heart rate changes through signals from the autonomic nervous system, hormones, and the heart's own built-in control systems. The autonomic nervous system has two main parts. The sympathetic nervous system raises heart rate, and the parasympathetic nervous system lowers it.

The sympathetic nervou...

The brain's cardiovascular center activates the ANS based on inputs received from sensory receptors.

For example, proprioceptors in muscles and joints sense changes in body position, and baroreceptors inside blood vessels detect changes in blood pressure.

Once activated, the ANS releases hormones and neurotransmitters to regulate h...