When adrenaline is secreted into the blood, the body undergoes a "fight or flight" response with several physiological changes:
- The heart beats faster and stronger, increasing blood flow and oxygen supply to muscles and vital organs.
- Breathing rate increases due to dilation of airways, allowing more oxygen intake.
- Blood vessels in the digestive system and skin constrict, diverting blood to skeletal muscles for heightened physical performance.
- The liver releases glucose into the blood for quick energy by breaking down glycogen stores.
- Fat breakdown (lipolysis) is stimulated to provide additional energy sources.
- The brain becomes more alert, and perception of pain is reduced.
- Muscles contract more efficiently through adrenaline's effects on various adrenergic receptors.
These coordinated effects prepare the body to respond rapidly to stress or danger by improving strength, speed, and sensory awareness.
