| http://www.w3.org/ns/prov#value | - peptide hormone; inhibits growth hormone release ??? ??? ??? adenosine caffeine, tea, and chocolate stimulate by blocking adenosine receptors; may be involved in sleep-wake cycle and terminating seizures; dilates arterioles, increasing blood flow to heart and other organs ??? ??? ??? neurotransmitter receptors either channel-linked receptors or G-protein linked ??? ??? ??? action potential large t
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