Transcript HB C3R
Cell Membrane How did it get there? Getting in Gas Exchange Misc Cell 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 Number of layers of the cell membrane Two What are the layers of the cell membrane made of? Phosolipids and Proteins The structures of the cell membranethat act as antennae to receive chemical messages Glycoproteins and glycolipids The nonpolar tails of phospholipids tend to repel ? and let ? Molecules pass through. Ions and fat soluble Explain the structures of this diagram… Water moving from a high to low concentration through a selectively permeable membrane. osmosis What is diffusion? Movement of molecules from a high to low concentration. What happens to the molecules when a cell reaches equilibrium? Concentrations are equal, but movement still occurs. What is facilitated diffusion? Diffusion (high to low concentrations) through protein channels to allow large molecules through. Two ways that facilitated diffusion and active transport are different. Low to high concentration, active requires energy. What are channels made of? protein What would happen if a cell was impermeable? die An animal cell surrounded by fresh water the turgor pressure can increase to the point the the cell will….. burst If a cell ‘s internal salt concentration is 5% What would happen to the cell if it was placed in water with .02% salt solution Water will diffusion into the cell. If a cell were treated with a chemical that inhibits active transport what would happen to the cell? Cell would die Which has a high O2 Concentration water or air air The primary concern of land gas exchange is.. Drying out of the surfaces The structure in the lungs of mammals that exchanges gases with the capillaries____ aveoli The total surface area of all the alveoli in the average person’s lungs? 2 meters 12 meters 60 meters 600 meters 60 meters Describe the path that air takes through the body. Nose, nasal cavity, trachea, pharynx, larynx, bronchus, bronchioles, alveoli, capillaries, blood through the body back to lungs and out. How do gases get in and out of plant cells? Stomates, surrounded by guard cells open and close to allow gases in and out. Function of oils and waxes on human skin Prevent water loss Plant water loss Transpiration What are three functions of the nephrons? Filtration, secretion and reabsorption Three types of nitrogen wastes secreted by animals. Ammonia-directly into water-fike fish Urea- diluted in water-Mammals Uric Acid-non-soluble, non toxic Birds and desert reptiles