Bio Topic 6
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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How is urea made
There is a process called deamination in which amino acids are broken down in the liver to form urea
Where is urine made
Urine is made in the kidneys
Describe osmoregulation
-control of balance of water and mineral salts in the body. -if the balance is incorrect cells may take in or lose too much water by osmosis. - cells become damaged
What is the function of the urinary system
Function: remove excess amounts of substances from the blood ,including water and mineral salts
What is the pathway of urine
1) kidney. 2) ureter. 3)bladder. 4) urethra. 5)out of the body
Describe what the renal arteries do
They carry blood from the body to the kidneys
Describe what the renal veins do
They carry blood with wastes remove back to the body
Describe the function of the kidneys
Remove substances from the blood and make urine
What does the ureters do
They carry urine from the kidneys to the bladder
What does the bladder do
It stores urine
How does the urine leave your body
Urine flows through the urethra to the outside of the body
What is dialysis
The clinical purification of blood by dialysis, as a substitute for normal function of the kidney
What is a nephron
It is the site in your kidneys in which urine is produced in the process of removing waste and excess substances from the blood
In a nephron where does the blood flow from and to
The blood will flow from the glomeulus into the bowman’s capsule
What three substances do the glomerulus and bowman’s capsule allow into the nephron
Water,urea and glucose
What is the name of the process in which water ,urea and glucose pass into the nephron
Filtration
What substances can’t get through the glomerulus
Protein and blood cells
Describe the whole process of selective reabsorption of glucose and water
1)The filtrate flows along the nephron. 2) at the first convoluted tubule certain, useful molecules such as glucose and water are reabsorbed back into the blood 3)proteins in the cell membrane of the first convoluted tubule pumps the glucose and water from the nephron to blood by active transport
Describe the whole process of selective reabsorption of water
1)Some water is reabsorbed via osmosis in the loop of Henie back into the blood 2) additional water may be absorbed from the collecting duct if the body is dehydrated
Describe excretion
At the end of the nephron the remaining fluid flows into the ureter The fluid containing excess water that the body doesn’t need plus urea and other substances now it is know as urine
What happens to your adh levels when water content is too high
1)Water content is too high 2) hypothalamus detects and pituitary gland releases less adh 3)adh makes the collecting ducts become less permeable 4)less water is reabsorbed 5 ) normal blood water content