A spring surface. hope that helped
Most stinging cells or underground, like nests {glad to help}
Caffeine and the other xanthines block the brain's receptors for a substance known as Adenosine , which is a neurotransmitter or neuromodulator.
The most popular central nervous system stimulant is caffeine. There are three main ways that caffeine affects the central nervous system that have been identified. Only at high non-physiological caffeine concentrations do intracellular calcium mobilisation and specific phosphodiesterase inhibition take place. The antagonism at the level of adenosine receptors is the only likely mechanism of action of the methylxanthine. Caffeine causes a relative brain hypoperfusion by increasing energy metabolism throughout the brain while simultaneously decreasing cerebral blood flow. Caffeine appears to affect the local release of dopamine by activating noradrenaline neurons. Many of caffeine's arousing effects could be attributed to the methylxanthine's effects on serotonin neurons.
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brainly.com/question/4199993
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