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Circulatory System: Purpose: - To deliver O2 & nutrients to all the cells of the body. -To transport waste, produced by the cells,to the gills and kidneys for excretion. -Examples of cellular waste: -Carbon dioxide -ammonia Fish have: 1. Closed circulatory system Contained in blood vessels 2. A 1 loop system 3. A low efficiency system Why? Clean and dirty blood mix A fish’s 1 loop system is made up of: Heart: pumps the blood Arteries: carries blood away from heart Veins: carries blood to the heart Capillaries: connects arteries to the veins -systemic (supply body) -respiratory (supply gills) Circulatory System Pathway of Blood: 3 4 2 1 1. Heart pumps blood thru arteries to capillaries in the gills 2. Blood picks up O2 & releases CO2 through the gills 3. From the gills the blood travels to body tissues where nutrients & wastes are exchanged 4. Blood goes back to heart thru veins veins gills Heart Gill capillaries arteries A Fish’s heart1. muscular pump that circulates blood around body 2. Has 2 chambers Atrium (upper) Ventricle (lower) Circulatory System: 2. Atrium 1. Sinus venosus 5. To gills 4. Bulbus arteriosus 3.Ventricle Pathway thru HEART: 1. CO2 dirty blood returns from body to Sinus Venosus (collection area) 2. To large Atrium 3. To muscular Ventricle (PUMP) 4. To Conus/Bulbus Arteriosus ~ saturated with blood vessels -has valves to decrease backflow 5. To Aorta (large artery) to body Circulatory System