Excretory System Flashcards
List the 3 functions of the excretory system?
Removal of waste and toxic substances
Control ph and ion concentrations
Balance water levels
Excretory organs include:
skin: sweating water and salts
lungs: carbon dioxide and water vapor
What does the liver do as part of the excretory system?
- Regulates blood glucose
- Detoxifies alcohol and drugs
- Breaks down amino acids
- Destroys old/damaged red blood cells
What are the kidneys role in the excretory system?
Filter blood and regulate salt concentration in blood, ph and water balance
Where does deamination of proteins occur?
Liver
What is excreted from proteins in the liver?
Nitrogenous parts
What is the pathway of blood through the kidney?
Aorta, Renal artery, kidney, renal vein
What are the two parts of the kidney?
Cortex (outer)
Medulla (inner)
What do the cortex and medulla contain?
1 million nephrons each
What are the 3 stages of urine formation?
Filtration, reabsorption and secretion
Where and how does filtration occur?
High pressure in the glomerulus forces water and small molecules from the blood into the bowmans capsule
What is not filtered from the blood?
Red blood cells and proteins due to their size
What are the primary filtrates?
Urea and uric acid
What primary filtrates are reabsorbed?
Glucose, salts, vitamins, water and amino acids
Where does reabsorption occur and how much?
99% in the tubules
