No. Caffeine and epinephrine are both stimulants. Caffeine stimulates the Central Nervous System (CNS) while epinephrine (also called adrenaline) stimulates the sympathetic nervous system. These both increase heart rate.
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Atropine increases the heart rate by increasing the sympathetic nerve stimulation while propanalol decreases the heart rate by decreasing the parasympathetic nerve stimulation.
yes it lowers heart rate
Frog's internal body temperature is lower than that of a mammal lower temperature = slower heart rate
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Because it's an adrenalin - it increases heart rate, constricts blood vessels and dilates air passages