BIOL 1051H Chapter Notes - Chapter 17: Thymus, Hypophyseal Portal System, Electrolyte
26 Mar 2018
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Two prominent systems: cns and endocrine, which communicate with neurotransmitters and hormones, respectively. The glands, tissues, and cells that screte hormones constitute the endocrine system. Most familiar hormone sources are the organs traditionally recognized as endocrine glands, such as the pituitary, thyroid and adrenal glands. Endocrine glands have an unusually high density of blood capillaries (fenestrated capillaries also have large pores in their walls allowing for the easy uptake of matter from the gland tissue) Li(cid:448)er (cid:272)ells do(cid:374)"t e(cid:454)a(cid:272)tl(cid:455) (cid:271)elo(cid:374)g to either group. Communicates by means of electrical impulses and neurotransmitters. Released neurotransmitters at synapses at specific target cells. Reacts quickly to stimuli, usually within 1-10 ms. Releases hormones into bloodstream for general distribution throughout the body. Reacts more slowly to stimuli, often taking seconds to days. Adapts relatively quickly to continual stimulation adapts relatively slowly; may respond for days to. Cells that work in ways similar to both groups are called neuroendocrine cells weeks.
