BIO 242 Lecture Notes - Lecture 1: Unified Atomic Mass Unit, Atomic Mass, Cell Membrane
Document Summary
Discuss the basic requirements of almost all cells. cell membrane: energy/food source. Internal environment has two components: bloodstream and plasma in the blood. Interstitial fluid that surrounds most tissues and interacts with the bloodstream to exchange nutrients, oxygen and waste. Differentiate between cytoplasm and cytosol: cytoplasm: everything in the cell (but the nucleus, cytosol: only the aqueous solution (not the organelles) Distinguish between the ecf and icf: ecf (extracellular fluid): body fluid outside the cell composed of blood plasma. Discuss the 2 main compartments of the ecf: plasma. Explain what is meant by homeostasis: maintenance of dynamic steady state of internal environment. Describe the cell membrane and its components: selectively permeable, lipids- main component, separate icf/ ecf, allow exchange of material, obtaining o2 + nutrients, getting rid of waste, nonpolar molecules, easily transported across the membrane (o2, co2, fatty acids) Ions + polar molecules: normally not transported (ex. Solution: homogenous mixture composed of two or more elements.
