13: Excretion in humans Flashcards
1
Q
Where is carbon dioxide excreted?
A
Through the lungs
2
Q
What do kidneys excrete?
A
Urea, excess water and ions
3
Q
What is the function of a nephron?
A
1 - Glomerulus in Ultrafiltration = filtration from the blood of water, glucose, urea, mineral ions
2 - Selective Reabsorption = reabsorbs ALL the glucose, some of the ions and most of the water BACK into the blood
3 - Formation of Urine = Urea, excess water, excess ions
4
Q
What is the role of the liver in the assimilation of amino acids?
A
It converts them into protein
5
Q
Where is urea formed? And how?
A
It is formed in the liver from excess amino acids
6
Q
What is deamination?
A
The removal of nitrogen-containing part of amino acids to form urea
7
Q
What is the importance of exretion?
A
- it prevents build up of waste or excess materials in the body
- prevents possible toxic effects to tissues this accumulation could cause
