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EXCRETORY SYSTEM. Excretory System – removes excess water, H 2 O, urea, carbon dioxide, CO 2 , and other wastes from our blood. Kidneys – filter out excess water and urea Lungs – filter out carbon dioxide, CO 2 , from the blood.
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Excretory System – removes excess water, H2O, urea, carbon dioxide, CO2, and other wastes from our blood. Kidneys – filter out excess water and urea Lungs – filter out carbon dioxide, CO2, from the blood. Skin – excretes water, as sweat, which contains some trace chemical wastes, including urea.
I. The Kidneys • Every drop of blood in your body is filtered by your kidneys more than 300 times per day! • Kidneys eliminate urea, minerals and excess water. • Kidneys regulate the amount of water we need to maintain in our bodies.
Kidneys – filter wastes and excess water from the blood. Ureters – tubes that take urine from the kidney to the urinary bladder. Urinary Bladder – a sack that stores urine. Urethra – small tube that leads urine out of the body.
human excretory system waste and what its removed by • carbon dioxide- lungs • water - skin, kidney, lungs • salts - skin, kidney • ammonia - liver • urea -kidney
THE EXCRETORY SYSTEM • The excretory system helps to remove body waste safely. • The kidneys act like filters.
KIDNEYS • The two kidneys are located near the spine in the middle of the back. • They are protected by lower ribs and covered by layers of fat.
KIDNEYS • Without the kidneys, it would not take long before the body’s system would be poisoned by its own waste. • It is possible to function with only one kidney.
human excretory system • consists of the kidneys, ureters, urinary bladder, urethra and renal circuit (renal arteries and renal veins) • kidney includes an outer cortex, middle medulla and the nephrons • nephrons include a capsule and a looping tubule that joins others to form the collecting ducts, making up the pyramids which empty into the calyces - lead into the renal pelvis
kidney Learn the parts Functions of the kidneys • excrete toxins and nitrogenous wastes • regulate chemical levels in blood • maintain water balance • helps regulate blood pressure (renin)
other organs • ureters - long narrow tubes with expanded upper end (renal pelvis) located inside each kidney. Function is to drain the renal pelvis to urinary bladder • urinary bladder- elastic muscular organ capable of great expansion. Function si storage of urine and voiding • urethra – passage of urine from bladder to outside of body. Passage of semen from male body
URINE • Waste drains out of the kidneys in the form of urine. • Urine is about 95% water and 5% urea (protein from protein breakdown). • Fresh urine has no bacteria in it. It is quite clean (probably cleaner than your hands).
