PRESENTATION OUTLINE
What is excretion?
Excretion is the removal of waste products from the chemical reactions that occur inside all living things.
What functions do the skin, kidney, liver, and lungs play in the excertory system process
Each of the following organs; skin, kidneys, lungs, and liver have a very important role in the excretory process that the human body must perform. Each organ assists with the process in different ways. For example the liver and lungs screen different toxins so that they may be excreted through either the skin via sweat, or the urinary or bowel tract.
What are the functions of the kidney and its parts
The kidneys are the waste filtering and disposal system of the body. As much as 1/3 of all blood leaving the heart passes into the kidneys to be filtered before flowing to the rest of the body’s tissues. While a person could live with only one functioning kidney, our kidneys are vital organs; the loss of both kidneys would lead to a rapid accumulation of wastes and death within a few days time.
How do the nephrons function?
The nephron is the basic functional and structural unit of the kidney. Its main function is to regulate the amount of water and soluble substances by filtering the blood and reabsorbing what is needed. The kidney's functions are vital to living and are regulated by the endocrine system.
What is the difference between filtration and reabsorption?
FILTRATION occurs between the glomerulus and Bowman's capsule. It is a physical process just like straining foods through a colander in the kitchen. Blood pressure squeezes blood against the capillary membranes in the glomerulus . Everything in the blood small enough to go through passes into the capsule,
REABSORBED back into the blood capillaries at the loops.
That happens by active transport and ATP is used . Therefore, the only materials staying in the loops, and eventually being excreted are water, salts & urea, and traces of other substances.
