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Lecture 22 - BIOL104-04 Principles of Biology I Lecture 22...

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BIOL104-04 Principles of Biology I October 20, 2010 Lecture # 22 Ch 51 Osmotic Regulation & the Urinary System
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Pulmonary circulation Systemic circulation Venae cavae Pulmonary artery Aorta Pulmonary vein A muscle cell in the left ventricle undergoes cellular respiration and releases a molecule of CO 2 . This molecule travels to the leg and then ultimately is exhaled in the lung. Place the following structures in the order (#1 - #14) the CO 2 molecule will travel. (7 points) __1 ___ Left ventricle _____ Pulmonary artery _____ Right ventricle _____ Aorta _____ Left atrium _____ Right atrium _____ Artery _____ Vein _____ Arteriole _____ Tissue Capillary _____ Venule _____ Pulmonary arteriole _____ Inferior vena cava _____ Pulmonary capillary Name _________________
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Homeostasis The balance of water & electrolytes is also important Water balance Intake & output are the same Need to also have balanced solutes – Sodium – Chloride – Potassium – Calcium Electrolytes - compounds that dissociates into ions when dissolved in water Electrolyte imbalance can lead to muscle spasms, confusion, irregular heartbeat, fatigue, paralysis, death
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Water balance Water in Absorbing it via osmosis – Drinking – Eating By-product of cellular respiration Water out Urine & feces – Evaporation Osmotic loss
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Osmotic pressure is a measure of concentration difference Osmosis always occurs from a more dilute
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