BIOL 031 Lecture Notes - Lecture 6: Paracellular Transport, Hydrostatics, Osmotic Pressure
17 May 2020
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Sympathetic drive norepinephrine dumped into system: also increasing heart rate, contractions, fight or flight. Baroreceptor reflex: control over blood pressure: homeostatic negative feedback loop, venous tone, loose store more blood, expands more, stiffen tighten up, flow velocity of blood. Increase venous tone more flow to heart. Hypertension high bp, hypo low bp. Continuous capillaries have leaky junctions: endothelial cell junctions, paracellular space, paracellular transport, trancytosis. Fenestrated capillaries have large pores: larger proteins/molecules come through, transporting epithelia, need to move things quickly. Capillary filtration and absorption use bulk flow : mass movement of fluid due to pressure, hydrostatic pressure (pcap, osmotic pressure (pi) Blood: plasma, rbcs, and wbcs: plasma fluids, water, water (92% of mass) Ions (e. g. hco3-: organic molecules (proteins, lipid, trace elements, gasses (co2, o2, rbcs most dense. Hematopoiesis: synthesis of blood cells: erythroblast reticulocyte erythrocyte. Bone marrow: site of blood cell production: in stroma.
