Physiology 1021 Lecture Notes - Lipid Bilayer, Fluid Compartments, Extracellular Fluid

• School: Western University
• Department: Physiology
• Course: Physiology 1021
• Professor: John Ciriello

Document Summary

Ability of the body to maintain a relatively constant internal environment. Regulated through negative feed back loops: decrease the impact of change. Extracellular fluid (interstitial fluid + plasma) bathe cells: act as a transition between external environment and intracellular fluid cytoplasm. Centrioles: cell division splitting equally directing dna. Long distance = essential for homeostasis: nervous and endocrine coordinate many homeostatic functions. Metabolism, heart rate, body temperature: chemical and electrical communication. Neurotransmitters: chemical signal: neuron target cell, only affect cells with receptor for chemical. Hormones: endocrine bloodstream target cell (with receptor) Neurohormones: neuron bloodstream target cell (with receptor) Cytokine: chemical signal made by any cell in response to stimuli. Gap junctions: protein channels form cytoplasmic bridges, direct transfer of chemicals and electrical signals, protein connexin . Must pass through in order to be processed: ion channels, enzymes, receptors. Movement of molecules from an area of high conc. Protein carrier binds to specific molecule carried to other side of membrane.