PSL300H1 Lecture Notes - Lecture 1: Blackboard, Homeostasis, Chemical Substance
Document Summary
Online quizzes on blackboard - only up for 3 days (3, 1% each) Tutorials - sign up on blackboard (online, sept 17) Science of how we stay alive and healthy. Holding an internal environment constant despite changing conditions. 1880s: claude bernard introduces the idea of homeostasis. Most active regulation is the intracellular ion concentrations. Sodium, chlorine, and potassium - icf and ecf have specific values. This gradient created below allows for proteins to be transported. Sodium-potassium pump, which is used in the brain. External and internal changes can cause disruption of homeostasis. Organism responds via compensating - almost always succeeds. If it fails, then illness and disease sets in. Challenge: lots of subtopics from biochem to cells to tissues to molecules. The entire spectrum is covered from smallest to the system level. There is 10 systems in total, 5 are covered in this course. Endocrine systems helps to regulate nutrients such as glucose.
