The Excretory System. The Elimina3on of Waste
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1 The Excretory System The Elimina3on of Waste
2 What is Excre3on? During our everyday ac/vi/es we produce a lot of waste. This build up of waste is toxic in our bodies and must be eliminated somehow Excre3on is the process of elimina3ng these waste products from our bodies.
3 4 Systems used for Elimina3on Integumentary: Sweat Glands in Skin Respiratory: Lungs Diges/ve: Intes3nes Urinary: Kidneys
4 Sweat Glands About found in the body They discharge secre/ons (sweat) by pores Swea/ng/perspira/on helps control our body temperature. Our sweat is made up of water and other waste materials that are from our blood. This is why it plays an important role in the excretory system
5 Capillaries surround alveoli and bring blood close for the oxygen and carbon dioxide to move by diffusion Respiratory System (Lungs) Microscopic structures in lungs called alveoli are the sites of gas exchange
6 Diges3ve System (Large Intes3nes) About 5 feet in length Tube like structure used to pass solid material Eliminates solid waste that come from undigested (indiges/ble) food
7 The Urinary System Composed of the following: Kidneys Ureters Bladder Urethra
8 Kidneys Two reddish beanshaped organs Eliminate waste and maintain water balance (homeostasis) through the produc/on of urine
9 Ureters Two tubes (25cm) in length; links a kidney to the bladder Transport urine produced in the kidneys to the bladder
10 Bladder Pear-shaped reservoir with elas3c walls & stretch receptors Stores urine un/l it is released through urina/on (sphincters) The bladder can hold about 1 liter of urine
11 Urethra Tube (3-4cm) in length in women 20cm in length in men Transports urine from the bladder to the outside
12 Composi3on of Urine The kidneys help maintain the blood in balance (homeostasis) They maintain mineral concentra3on and the amount of water found in the blood If an excess of either is found in the blood, the kidneys will simply excrete them
13 The kidneys filter blood They remove waste by producing a liquid Urine Urea is the main waste product from the blood (made up of carbon dioxide, nitrogen and oxygen) It is created by the breakdown of proteins and amino acids used by the cells of our body
14 Urine is made up of the following: Water (95%) Urea (2.5%) Minerals Substances that are excess in the blood Protein, glucose, fats or blood cells (indica3on of health problems) Traces of medica/on, drugs
15 The amount of urine produced depends on the concentration of minerals and water in the body. If concentration of minerals is low, kidneys will excrete more water. If concentration of minerals high, kidneys excrete less water and we feel thirsty!!!
16 Kidney Disorders and Diseases 1. Hypertension: High Blood Pressure Narrowed arteries in the kidneys can damage kidneys. Too much fluid can also raise blood pressure Damaged blood vessels may stop the removal of wastes or fluid from the body
17 Kidney Disorders and Diseases 2. Diabetes Glucose found in urine High glucose levels can damage blood vessels, stopping them from filtering blood Can also damage nerves that tell bladder when it is full, which can lead to bladder lining being damaged and possible other infections.
18 Kidney Disorders and Diseases 3. Urinary Tract Infection (UTI) Caused by E.Coli bacteria More common in women than in men Can lead to Kidney Infection when it moves upwards
19 Kidney Disorders and Diseases Urinary Tract Infection (UTI) Symptoms include: Burning sensation during urination Increased frequency of urination Blood in urine
20 Kidney Disorders and Diseases 5. Proteinuria High amounts of protein found in urine Caused by damaged tubules in kidneys Sign of chronic Kidney Disease Proteins found in blood seep into urine as kidneys are filtering blood The protein is supposed to stay within the body
21 Kidney Disorders and Diseases 6. Kidney Stones Hard insoluble crystallized stones found in urinary tract Accumulation of calcium in blood (80%), uric acid (5%) or magnesium (2%) Stones pass down ureters
22 Kidney Disorders and Diseases Kidney Stones Very painful Can shutdown kidneys temporarily Can be broken up by ultrasound, surgically removed, or pass through system on their own
23 Kidney Disorders and Diseases 7. Kidney Failure Kidneys stop functioning Renal dialysis can be used on a short term basis to filter blood Hooked up to dialysis machine for several days a week Major change in lifestyle Kidney transplant eventually needed
24
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