BSC 2023 Lecture Notes - Lecture 16: Homeostasis, Archaea, Lipid Bilayer
Document Summary
Homeostasis state of body equilibrium where the body"s internal environment remains relatively constant and within psychological limits. Negative feedback operates to reduce or eliminate changes detected by the stimulus receptor. Cell smallest unit that displays the property of life. Characteristics of a cell a. ) seen using microscope (large surface area-to-volume ratio) b. ) most are width of human hair c. ) over 200 different cell types in human body d. ) 50 to 60 trillion cells in human body. Major theory in biology that states the following: 1. a cell is the basic unit of life: all living things are made up of cells, new cells arise from pre-existing cells. Prokaryotes - lacks a membrane-bound nucleus and membranous organelles. Plasma membrane outer membrane that regulates what enters and leaves the cell. boundary between the outside and inside of the cell. What is the plasma membrane composed of? phospholipid bilayer with attached or embedded proteins. Selectively permeable allows certain molecules to enter or exit.
