mcdb 1b study guide
mcdb 1b study guide MCDB 1B
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This 3 page Study Guide was uploaded by Anahit Ghaltaghchyan on Sunday March 6, 2016. The Study Guide belongs to MCDB 1B at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months taught by Finkelstein in Winter 2016. Since its upload, it has received 54 views. For similar materials see MCDB 1B in Microbiology at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months.
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Amazing. Wouldn't have passed this test without these notes. Hoping this notetaker will be around for the final!
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Date Created: 03/06/16
Study Guide Circulatory System • Circulatory system relies on variety of mechanisms to move materials among body parts: • macroscopic pumps and 1way valves > directional flow • activity of macroscopic pumps depends on action potentials, which depend on electrochemical gradients maintained by Na+ /K+ pump and ion channels out in • exchange of materials in capillary beds relies on concentration gradients of specific molecules, balance between blood and osmotic pressure, differential permeabilities • vessel anatomy reflects functional requirements • gas exchange loading/unloading promoted by concentration gradients maintained by rapid blood flow • proteins/enzymes convert gases to more soluble form • flow rate subject to local and systemic control Excretory System •Driving force for bulk material flow = blood pressure (regulated locally and systemically) •Major regulation of filtration by maintaining local (glomerular) and systemic blood pressure •Systemic responses regulate blood pressure via effects on arterial constriction and blood volume •Blood volume adjusted by effects on reabsorption of solutes and water, and thirst •Water follows solutes osmotically; regulation of solute movement is key determinant of water balance•Local flow of specific molecules (ions, glucose, water, etc.) determined by different permeabilities and concentration gradients within tissue, specific secretion of some •Countercurrent exchange creates steep osmotic gradient in tissue surrounding tubules > extreme concentration of filtrate driven osmotically Plant Cell • Cell wall imposes many constraints on growth because cell position fixed • Growth requires turgor pressure (& increased vacuolar volume) to stretch walls • Cellulose is major structural component of wall; orientation of microfibrils determines orientation of cell elongation and therefore overall plant shape • Secondary wall too rigid to permit further expansion • Cell wall creates 2 major compartments of plant body: apoplast and symplast • Water and minerals move in transpirationstream: roots > leaves > air• Massive water flux: ~500g water transpired for each ~1g organic matter produced • Driving force for movement is water potential (Y) gradient • Flow rate determined by gradient strength (environmental factors) and resistance (vessel and pore diameter) • Water column is (usually) under tension • Majority of movement is apoplastic, but all must enter symplast at endodermal layer• Entry into symplast is opportunity for selectivity, involves active transport of ions, often against substantial concentration gradients • Light energy captured by exciting electron of pigment • •Excitation energy is transferred to photocenter • •Electron is transferred to redox carriers drives chemiosmotic ATP synthesis • •Capacity to use water as ultimate electron donor permits final transfer of electron to NADP+ • •Light reactions occur in thylakoids, but ATP and NADPH produced in stroma • •Water splitting produces O2 (a useful byproduct for us!) • • Summary of C fixation
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