Chapter 6 - Communications

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Last updated 4:45 AM on 10/8/26
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12 Terms

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gap junctions

direct cytoplasmic transfer between adjacent cells

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contact-dependent signals

surface to surface contact between membranes

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hormones

released from tissue and travels to target cell through blood

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neurotransmitters

released through neurons to adjacent effector

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neurohormone

released from neuron and travels to target cell through blood

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paracrine agent

released into interstitial fluid and affects neighboring target cell

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autocrine agent

released into interstitial fluid and affects the cell that released it

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receptors

a protein associated with the membrane or cellular interior which will bind a chemical messenger and exert an effect

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lipophilic messengers

diffuse directly through the membrane to an internal receptor

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lipophobic messengers

must enter cell through transport or bind to a surface receptor

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agonist

chemical messenger that binds to a receptor and triggers a cell’s response

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antagonist

molecule that competes with another for a receptor and binds to the receptor but doesn’t trigger a cellular response