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Bacteriology
What is excretion?
Excretion is the process by which metabolic
wastes and other non-useful materials are
eliminated from an organism.
End stage of metabolism
Bacteriology
What are the main functions of the excretion process?
Maintain body's homeostasis
Excrete non-useful substances from body
Bacteriology
Which processes do the excretory process influence?
Osmotic pressure
Acid-alkaline balance
Na/K Ca/P ratio
excrete excess water
excrete unused end products
Bacteriology
What excretion organs are there?
Lungs, sweat glands, kidneys, GI tract
Bacteriology
What do sweat glands excrete?
Water, endproducts of protein metabolism, salts, nitrogen containing substances
Bacteriology
What does the dig. system excrete?
Food end products, dig. juices, minerals, some drugs
Bacteriology
Kidney functions?
Excrete metabolic endproducts, maintain osmotic pressure, pH, salt composition, regulate arterial pressure, erythropoesis
Bacteriology
Filtration is a _____ process
purely physical
Bacteriology
Filtration is possible due to:
high arterial pressure, low oncotic pressure, low backpressure
Bacteriology
If the blood pressure increases then filtration
increases
Bacteriology
Reabsorption is a ______ process
physical and physiological
Bacteriology
What is the renal threshold?
concentration of a substance dissolved in
the blood above which the kidneys begin to remove it into the urine. when exceeded reabsorption is incomplete, parts remain
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