PSL300H1 Study Guide - Final Guide: Uterine Contraction, Negative Feedback, Positive Feedback
Document Summary
Physiology is science of how the body functions. Physiology spans from molecules to organism; there"s an interaction between molecular biology and physiology. Key aspect : homeostatis*** defined at the process of maintaining constant internal environment despite environmental changes. **negative feedback will occur in order to maintain homeostatis. Example of positive feedback: oxytocin and control of uterine contractions stimulus inhibits the initial stimulus. loss of negative feedback = disease. injecting oxytoxin pushes the baby, cause the cervix to contract. process can be artificially stimulated. Feedback control: integration center is the brain, but also the endocrine system. Biological rhymths result from the change in setpoint. In order to establish and maintain homeostatis, we need cell-to-cell communication. Gap junctions: form direct cytoplasmic connection beteen cells. ex. heart. Contact dependent: require interaction btwn membrane molecules on two cells. ex. immune based mechanism.
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