MEDICAL PHYSIOLOGY

Detailed explanation-1: -Your sympathetic nervous system is best known for its role in responding to dangerous or stressful situations. In these situations, your sympathetic nervous system activates to speed up your heart rate, deliver more blood to areas of your body that need more oxygen or other responses to help your get out of danger.

Detailed explanation-2: -The amygdala tells the cortex how to respond-fight or flee-and the cortex passes this message onto the peripheral nervous system. Your extremities start to tingle, you start to sweat, your heart rate increases, your muscles tense. This fight or flight reaction is mobilized by the sympathetic nervous system.

Detailed explanation-3: -The autonomic nervous system is a component of the peripheral nervous system that regulates involuntary physiologic processes including heart rate, blood pressure, respiration, digestion, and sexual arousal.

Detailed explanation-4: -What does the peripheral nervous system do? The nerves of the peripheral nervous system are responsible for relaying information between the body and the brain. This includes involuntary body functions such as breathing, blood flow, and heartbeat as well as sensory information and control of voluntary movement.

Detailed explanation-5: -The sympathetic nervous system releases norepinephrine (NE) while the parasympathetic nervous system releases acetylcholine (ACh). Sympathetic stimulation increases heart rate and myocardial contractility.