Circulation and Gas Exchange Chapter 42
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1 Circulation and Gas Exchange Chapter 42 Circulatory systems link exchange surfaces with cells throughout the body Diffusion is only efficient over small distances In small and/or thin animals, cells can exchange materials directly with the surrounding medium Cells exchange materials with the environment via a fluid-filled circulatory system in most animals Gastrovascular cavities Digest and distribute substances Can have large surface area to volume ratio Circulatory systems minimize diffusion distances A circulatory system has A circulatory fluid A set of interconnecting vessels A muscular pump Connects the fluid that surrounds cells with the organs that exchange gases, absorb nutrients, and dispose of wastes Open circulatory systems Blood bathes the organs directly General body fluid is called hemolymph Insects, other arthropods, and most molluscs, Closed circulatory systems Blood is confined to vessels and is distinct from the interstitial fluid Annelids, cephalopods, and vertebrates 1
2 Vertebrate circulatory systems Closed circulatory system called the cardiovascular system The three main types of blood vessels are arteries, veins, and capillaries Arteries branch into arterioles and carry blood away from the heart to capillaries Capillary beds are the sites of chemical exchange between the blood and interstitial fluid Venules converge into veins and return blood from capillaries to the heart Single Circulation Bony fishes, rays, and sharks have single circulation with a two-chambered heart In single circulation, blood leaving the heart passes through two capillary beds before returning Double circulation Oxygen-poor and oxygen-rich blood are pumped separately Amphibians have a three-chambered heart When underwater, blood flow to the lungs is shut off Double Circulation Mammals and birds have a four-chambered heart The left side of the heart pumps and receives only oxygen-rich blood, while the right side receives and pumps only oxygen-poor blood Endotherms require more oxygen Cardiac cycle The contraction, or pumping, phase is called systole The relaxation, or filling, phase is called diastole The heart rate is the number of beats per minute The stroke volume is the amount of blood pumped in a single contraction The cardiac output is the volume of blood pumped into the systemic circulation per minute and depends on both the heart rate and stroke volume 2
3 Four valves prevent backflow of blood in the heart Velocity slowest at capillaries Blood flows from areas of higher pressure to areas of lower pressure 3
4 Components of blood Blood clotting Gas exchange occurs across specialized respiratory surfaces A gas diffuses from a region of higher partial pressure to a region of lower partial pressure Gases diffuse down pressure gradients in the lungs and other organs as a result of differences in partial pressure Respiratory media and surfaces Animals require large, moist respiratory surfaces for exchange of gases between their cells and the respiratory medium, either air or water Less oxygen in water than in air Gas exchange across respiratory surfaces takes place by diffusion Respiratory surfaces include the outer surface, skin, gills, tracheae, and lungs 4
5 Gills in aquatic animals Gills are outfoldings of the body that create a large surface area for gas exchange Fish gills use a countercurrent exchange system Blood is always less saturated with O 2 than the water it meets, enhancing diffusion Tracheal systems in insects Mammalian lungs Supply O 2 directly to body cells Larger insects must ventilate their tracheal system to meet O2 demands Lungs Gas exchange takes place in alveoli, air sacs at the tips of bronchioles Gases diffuses through the moist film of the epithelium and capillaries Alveoli lack cilia and are susceptible to contamination Secretions called surfactants coat the surface of the alveoli Breathing ventilates the lungs The process that ventilates the lungs is breathing, the alternate inhalation and exhalation of air An amphibian such as a frog ventilates its lungs by positive pressure breathing, which forces air down the trachea 5
6 Birds have multiple air sacs that keep air flowing through the lungs Air passes through the lungs in one direction only Mammals ventilate their lungs by negative pressure breathing, which pulls air into the lungs Lung volume increases as the rib muscles and diaphragm contract Respiratory Pigments Respiratory pigments, proteins that transport oxygen, greatly increase the amount of oxygen that blood can carry Arthropods and many mollusks have hemocyanin with copper as the oxygen-binding component Most vertebrates and some invertebrates use hemoglobin In vertebrates, hemoglobin is contained within erythrocytes Respiratory adaptations of diving mammals Have a high blood to body volume ratio Stockpile O 2 and deplete it slowly Diving mammals can store oxygen in their muscles in myoglobin proteins Diving mammals also conserve oxygen by Changing their buoyancy to glide passively Decreasing blood supply to muscles Deriving ATP in muscles from fermentation once oxygen is depleted 6
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