BIOL 1202 Chapter : Chapter 42 + Mastering Biology
Document Summary
Contraction of smooth muscle layer in the arterioles: 2. Insect trachea (f42. 24: tracheae are elaborately branched internal tubes that deliver air to body cells, mammalian respiratory system (f42. 25) 42. 6: breathing ventilates the lungs: how amphibians breathe, many use gills as larvae and simple, sac-like lungs as terrestrial adults. Skin used to supplement respiration: ventilate lungs by positive pressure. Force air down trachea: how a mammal breathes (f42. 28, mammals ventilate their lungs by negative pressure breathing, decreasing air pressure in the lungs draws air in; increasing pressure pushes air out, pressure is inversely related to volcume. A sudden drastic drop in atmospheric pressure: how a bird breathes (f42. 27, birds have lungs + 8 or 9 air sacs. Functions as bellows that keep air flowing through the lungs: air passes through the lungs in one direction, always o2 rich air in the lungs. Inhalation air sacs fill: exhalation air sacs empty; lungs fill.
