Answer to Question 1
Caffeine blocks the brain's receptors for the neurotransmitter or neuromodulator adenosine, which acts on the brain to produce behavioral sedation by inhibiting the release of other neurotransmitters. Blood vessels in the brain are constricted due to caffeine intake. This may be why it is good for headaches.
Answer to Question 2
Tea was the first popular caffeine drink in the U.S. Tea taxes led to the Boston Tea Party, a rejection of tea shipments that helped lead up to the revolution. Americans then began to drink more coffee and less tea. The English drank more tea as a show of support for the crown.
Cellular locations of pattern recognition molecules of the innate immune system
(a) Mammal species from central Saskatchewan differ greatly in their isotopic signatures. (b) There
Side-effects of major chemotherapy agents
The Excretory System Water and waste products from cells
The Conduction System
Major muscles of the human musculoskeletal system