How caffeine wakes you up: 1. Stomach……….stimulates acid production. 2. Blood……..Transports caffeine to organs. 3. Heart……Higher pulse. 4. Brain……Stimulates by replacing the brain’s own slow-down chemical. - Effect- Alertness, concentration. Constrains blood vessels to the brain. - Effect- Helps migraine headache. 5. Lungs……Relaxes involuntary muscles. - Effect- Helps asthma 6. Muscles…..Stimulates voluntary muscles for higher performance. 7. Kidneys…..Stimulates urine production. 8. Intestines….Relaxes involuntary muscles….such as in colon. Peak effect: 15 to 45minutes. Total effect: 2 hours generally