1 / 10

IE 553 Engineering of Human Work Dr. Andris Freivalds Class #21

IE 553 Engineering of Human Work Dr. Andris Freivalds Class #21. Circulatory Systems ( Å&R, Ch.4). Homeostasis – constant environment Bulk flow vs. Diffusion Functions: Transportation of Supplies: food, O 2 , Wastes: metabolites, CO 2 Hormones Regulation of heat flow

sachi
Download Presentation

IE 553 Engineering of Human Work Dr. Andris Freivalds Class #21

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #21 IE 553

  2. Circulatory Systems (Å&R, Ch.4) • Homeostasis – constant environment • Bulk flow vs. Diffusion • Functions: • Transportation of • Supplies: food, O2, • Wastes: metabolites, CO2 • Hormones • Regulation of heat flow • pH buffer (acid-base balance) IE 553

  3. Circulatory System IE 553

  4. Body Water and Blood • Body = 60% water • Blood = 5l • Composed: plasma + cells • Red blood cells (%hematocrit) • White blood cells • Platelets (+ fibrinogen → clotting) IE 553

  5. Heart IE 553

  6. Contraction Process 1) 2) 3) 4) • Sinoatrial node (pacemaker) – spontaneous depolarization • Atrioventricular node – delays conduction • Purkinje fibers –polarization spreads • 4) Ventricles contract IE 553

  7. Mechanics of the Contraction Process IE 553

  8. Pressure Regulation IE 553

  9. Terminology -1 • Heart rate (HR) = #QRS/min • Cardiac output (CO) = volume of blood ejected by ventricle • Stroke volume (SV) = volume of blood ejected by each ventricular beat • Oxygen uptake (VO2) = volume of oxygen extracted from inspired air • Atrio-ventricular difference (AVO2) IE 553

  10. Terminology - 2 • Systolic pressure (SP) = max pressure during ventricular ejection • Diastolic pressure (DP) = min pressure before ventricular ejection • Mean arterial pressure (MAP) = ‘average’ pressure • Total peripheral resistance (TPR) = resistance to blood flow, R = kl/r4 IE 553

More Related