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Terms in this set (31)
The process of removing excess wastes and water from the body.
Parts of the excretory system
skin, large intestine, liver, lungs, and kidneys
removes excess water/salts
eliminates solid wastes
breaks down amino acids and toxins in the blood known as the detox organ
exhale water and carbon dioxide (cellular respiration)
filter waste and water from the blood and out of the body
chief organ of excretion, they function to filter blood and form urine
is the liquid waste product of the body that is excreted by the urinary system
are the structural and functional units of the kidneys. A single kidney may have more than a million of these.
two muscular tubes that move the urine by peristalsis to the bladder
is a hollow, sac-like organ that stores urine.
a hollow tube that carries urine out of the body
Parts of a kidney
Vital role kidney plays in homeostasis list 4 things that it does
1 They filter all the blood in the body many times each day 2. produce a total of about 1.5 liters of urine.
3. The kidneys control the amount of water, ions, and other substances in the blood by excreting more or less of them in urine.
4. The kidneys also secrete hormones that help maintain homeostasis.
turns ammonia to urea carried by blood to the kidney
steps nephron take to filter blood and form urine
1. Blood enters the kidney through the renal artery, which branches into capillaries. When blood passes through capillaries of the glomerulus of a nephron, blood pressure forces some of the water and dissolved substances in the blood to cross the capillary walls into Bowman's capsule.
2. The filtered substances pass to the renal tubule of the nephron. In the renal tubule, some of the filtered substances are reabsorbed and returned to the bloodstream. Other substances are secreted into the fluid.
3. The fluid passes to a collecting duct, which reabsorbs some of the water and returns it to the bloodstream. The fluid that remains in the collecting duct is urine.
a capsule-shaped membranous structure surrounding the glomerulus of each nephron in the kidneys of mammals that extracts wastes, excess salts, and water from the blood.
is a network of capillaries located at the beginning of a nephron in the kidney. It serves as the first stage in the filtering process of the blood carried out by the nephron in its formation of urine.
1step in urine formation pressure causes fluids from blood to enter empty space in Bowmans Capsule=filtrate leaving blood cells and proteins behind
Reabsorption and Secretion
2nd step filtrate enters renal tubules water and some ions get reabsorbed at the end toxins filter into tubules
3rd step to urine formation water urea and salts pass into collecting duct, which removes more water causing urine to be 4x as concentrated as blood
the involuntary constriction and relaxation of the muscles of the intestine or another canal, creating wavelike movements that push the contents of the canal forward. Ureter uses this motion to push fluids not the bladder.
How much urine can the bladder hold
How much urine is released each day
1.5-2.3 L a day
When the bladder is 1/2 full, it sends a signal to this muscle which then contracts bladder muscles while relaxing urethra muscles and urine can leave the body
You can live with how many good kidneys
mineral crystals that form in urine. They block ureter and are very painful
urinary tract infection
treatable bacterial infection very common in women
can cause capillary damage which means kidney failure
blood is filtered with a machine due to kidney failure
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