Transcript EXCRETION - St. Dominic High School
EXCRETION
Structure and Function
Lesson 1
Do Now
Watch the video: Brain Pop - Urinary System and complete the multiple choice worksheet
The removal of the metabolic waste products produced by
cells
CO2 H20 Nitrogen compounds/proteins – (ammonia, urea, uric acid) Salts – NaCl
Regulated
by nerves and hormones
Structures
Urinary System Skin
1. Urinary System:
Homeostasis
maintaining a stable internal environment: Fluid inside and around cells the regulation of chemicals in the blood is done by the
kidney
Human Urinary System
2 Kidneys filter blood – remove wastes 1 artery brings blood to kidney 2 Ureters carries urine to bladder 1 Bladder urine storage 1 Urethra takes urine out of the body
Kidney
maintain H20, maintains salt, maintain blood pH, maintain blood volume, rids nitrogen waste Nephron = function unit of the kidney (filters)
Feed back mechanism
= blood volume and H20 levels increase urine production will increase Ex: if you sweat lose H20 volume decreases blood stimulates brain sends signal to kidney to keep more H20 less urine is made
Reabsorption
kidneys filter all the blood in the body approx. Every 45 minutes 99% of the water that enters the
bowman’s capsule
is reabsorbed into the blood
Urine formation
All material that remains after filtration and reabsorption is called
urine
made up of urea, excess salts, and water stored in the bladder until released from the body through the
urethra
Homework
Excretion practice questions
Skin
Lesson 2
Do Now
Urinary System Vocabulary worksheet
2. Integumentary System
Skin
Largest organ in the body! – sense organ surrounds protects (water proof) regulates fluid, salt and urea by sweat
3. Liver
Important in maintaining homeostasis, makes proteins Makes bile Help digest fats Stores glucose and vitamins Detoxifies toxins: ex: alcohol Breaks down RBC’s Breaks down amino acids – urea
Disorders
Gout
Nephritis
Kidney stones
Kidney disease
Kidney transplant
In class assignment
Review for test