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Lesson 5 – The Excretory System. Chapter 3 – Human Body Systems. What does the excretory system do?. It gets rid of wastes: solid waste from digestion (through the large intestine) carbon dioxide from cells (through the lungs). What does the excretory system do?.
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Lesson 5 – The Excretory System Chapter 3 – Human Body Systems
What does the excretory system do? • It gets rid of wastes: • solid waste from digestion (through the large intestine) • carbon dioxide from cells (through the lungs)
What does the excretory system do? • It gets rid of wastes: • liquid waste from cells (through the kidneys, which filter wastes out of the blood and then produce urine) • sweat (through the skin)
How does your body filter blood? • Blood passes through the kidneys 60 times a day. • The kidneys remove substances the body no longer needs and returns substances it does need. • Nephron – part of the kidney where wastes are separated from useful materials
What happens if the kidneys stop working? • Wastes can build up to dangerous levels. • People with this problem need dialysis, a treatment where a machine does the job of the kidneys.
How does your body get rid of liquid wastes? • Through the urinary system: • Urine is released from the body. • Through the skin: • Sweat is released through tiny openings in the skin calledpores.
