8th grade ch 4 sec 3 excretory system

Ch. 4 Sec. 3Ch. 4 Sec. 3Excretory SystemExcretory System

The Excretory System

Removes solid

liquid &

wastes

kidneys

major organsof excretion

eliminate urea, excess water, &

other wastes

• To locate your kidneys, put your hands on your hips, then slide your hands up until you can feel your ribs.

• Now if you put your thumbs on your back, you will know where your kidneys are.

• You can't feel them, but they are there.

bladder

•muscular bag that holds urine

• tube that carries urine from kidney bladder

• tube thru. which urine passes out of body

ureterureter

urethraurethra

Kidneys are essential to our well-being. Though they are small – about the size of a

clenched fist – people can’t survive very

long without them.

• Normally, people have two kidneys, located just under the ribs in the middle of the back.

• About 10 centimeters long and shaped like kidney beans, they are often called the body’s “master chemists” because of all the functions they perform.

urea= chemical that comes from breakdown of proteins - formed in liver

A chemical analysis can be useful in detecting medical problems. Normally, urine contains almost no glucose or protein.

nephrons•Tiny, filtering factories found in kidneys

•Remove wastes from blood & produces urine

urinary system

bladder - a hollow organ that stores urine until it is excreted. kidney – 2 bean-shaped organs that take waste from the blood & produce urine. ureter - 2 tubes, each of which carries urine from a kidney to the bladder. urethra - the tube that carries urine from the bladder out of the body.

bladder

kidney

ureter

urethra