01:119:115 Lecture Notes - Lecture 11: Homeostasis, Amniote, Blood Sugar
18 Mar 2018
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> seq glucose homeostasis (remainder of semester: organ systems and focus on humans) Introduction to homeostasis: definition, the ability to maintain a constant internal environment in response to environmental changes, homeo = similar, stasis = standing, feedback = regulation. Stimulus (change in state) -> sensor -> response (physiologic activity) Different organisms" bodies need higher/lower h2o concentration than the surrounding environment. Kidneys regulate solute levels -> water homeostasis. Examples of homeostasis: protocells, groups of lipids, non-living, isotonic inner environment, semipermeable membrane. Seeds - own internal environment: humans, animals > phylum chordata, clade amniota - amniotic sac, traits evolved in water -> need adaptations to function on land, maintain a complex internal environment. Summary: all living (and some nonliving things) have homeostasis, mechanisms, requirements depend on environment and morphology, smaller, aquatic/marine - often osmosis and diffusion. Homeostasis in animals: constraints on animals (fig 40. 2, body shape/size = limited by the environment. Complex organisms have a hierarchical organization (fig 40. 5)
