PP 993-998 EXCRETORY SYSTEM

FUNCTION Every cell in the body produces metabolic waste. The skin, lungs, and kidneys make up this system.

SKIN (Integumentary System) Excretes water, salts, small amounts of nitrogenous wastes

Lungs Excrete water vapor and CO2

URINARY SYSTEM Formation and excretion of urine Mostly water to keep wastes dissolved and easier to excrete (nitrogenous waste).

Step 1: FILTRATION Blood forced into kidneys to clean out urea (created in liver), toxins, mineral salts, and water to form urine.

Step 2: REABSORPTION Some substances return to blood to maintain balance (through vena cava/vein)

Step 3: ELIMINATION Urine passes through the ureters to be stored in bladder until it is secreted through the urethra

URINE Normally made of urea, water, salt and has a very light yellow color

WHAT URINE TELLS US Proteins may leak into the urine if the kidney is damaged Too dark in color indicates dehydration Brown color indicates bleeding from the kidneys Urine will have a high glucose count if the individual is diabetic Low or no glucose indicates hypoglycemia, which results from too much insulin

Assignments Class Work: Finish Digestion mobile HW: Coloring pages 4-5 and Digestion Lab due tomorrow!