BIOL 1201 Lecture Notes - Lecture 5: Thromboxane A2, Blood Sugar, Diabetes Mellitus Type 2
30 Nov 2016
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When epinephrine binds to cardiac muscle cells, it speeds their contraction. When it binds to muscle cells of the small intestine, it inhibits their contraction. Hormone secreted in bloodstream, yet only attacks specific tissue. (not answer, just fact). Local: signal molecule released into extracellular liquid and signal cells in immediate area. Paracrine (happens when you get a cut or injury) and synaptic (gap between neurons in the nervous system) signals. When a platelet contacts a damaged blood vessel, it is stimulated to release thromboxane a2. Thromboxane a2 in turn stimulates vascular spasm and attracts additional platelets to the injured site. In this example thromboxane a2 is acting as: direct contact, local signal molecule, distant signal molecule. Many: )f you don"t have the receptor, you will not be able to receive the signal. What makes it a target cell is whether it has a signal or not: plasma membrane in 11. 6, all cell signaling receptors are proteins.
