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Terms in this set (31)
Where is urea formed and from what?
in the liver from excess amino acids
Where is carbon dioxide excreted from?
What do the kidneys excrete?
urea, excess water and salts
What is the volume and concentration of urine produced affected by?
water intake, temperature and exercise
What does the liver do?
Assimilates amino acids by converting them to proteins, including plasma proteins like fibrinogen and breaks down Alcohol, drugs & hormones
What is the function of the kidney?
Removal of urea and excess water and the re absorption of glucose and some salts
What is deamination?
The removal of the nitrogen-containing part of amino acids to form urea
Explain the need for excretion, limited to
toxicity of urea and carbon dioxide
What are the 3 main structures of the kidney?
Cortex, Medulla and Pelvis
What is the role of the glomerulus?
in the filtration from the blood of water, glucose, urea and salts
What is the role of the tubule?
reabsorbs glucose, most of the water and some salts back into the blood, leading to the concentration of urea in the urine as well as loss of excess water and salts in the tubule
What does the cortex contain?
Bowman's capsules and coiled tubules
What does the Ureter do?
Carries urine from kidney to bladder
What does the medulla contain?
Loops of Henlé and collecting ducts
What does the Loop of Henlé do?
Selectively absorbs water/solutes
What do the collecting ducts do?
reabsorbs water into blood and store wastes until they are passed into ureter
What does the Urethra do?
Carries urine from bladder to the outside.
What does the bladder do?
What does the Renal capsule do?
filters from blood: water, glucose, urea and salts.
What does the renal artery do?
brings wastes and water from blood
What does the Renal vein do?
Reabsorbs water and useful molecules and leaves wastes behind
What does the skin excrete?
excess water, salts and urea in the form of sweat
What is ultrafiltration?
blood from renal artery enters the
glomerulus. Water, urea, salts and glucose are forced into the Bowman's capsule. Blood cells and large proteins cannot pass through
What is Selective reabsorption?
in the proximal tubule two thirds of the salt and water and all the glucose moves out of the nephron, by active transport. These substances are reabsorbed back into the blood capillary.
What is happens inside the nephrons?
1- Blood arrives from renal artery into glomerulus 2- small molecules enter bowman's or renal capsule 3- This moves down onto the nephron 4- in the convoluted tube cells reabsorb glucose, amino acids, most salts and water 4- continues through the nephron 5- urine moves on but water is saved in the loop of Henley and collecting duct
What is the glomeral filtrate made up of?
Water, Glucose, Urea and Salts
What is dialysis?
When a kidney machine takes a patients blood and cleans it, then returns the blood to circulation
How does Dialysis work?
The machine from the patient t passes a pump and then the dialysis tubing filtrates it as it is semi permeable and the
Disadvantages of Dialysis?
More expensive in the long run, very disruptive since its 3 sessions 7hrs, needs to be near a machine
Disadvantages of Transplant?
It is very hard to get a kidney donation which in the end your body can reject and you need to take immune suppressing drugs
Advantages of transplant?
Less expensive in the long run, not very disruptive, can go anywhere, anytime
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