excretion: liver, excretory organs, urinary system Flashcards
Excretion
↪ Removal of waste produce from body formed from metabolic waste.
What is the function of the liver in excretion?
NOT excretory organ, waste products formed in liver.
What waste products are formed in the liver?
–Nitrogenous waste
*Urea- Formed from: excess amino acids
*Uric acid- nucleic acids
*Creatinine- Creatine phosphate
–Non-nitrogenous waste
*Toxins and drugs
*Alcohol
–Bile pigments formed from breakdown of red blood cells ()
–Cholesterol Formed from breakdown of bile salts
Name and explain functions of the different excretory organs
Kidney
➽Excretes NITROGENOUS and NON-NITROGENOUS waste.
Lungs
➽Excretes CO2 + a little 💧 and heat cause of cellular respiration.
Skin
➽Excretes sweat (H20, salt, urea). Sweat = excretion (gets rid of waste) + secretion (Helps maintain body 🌡️ cause heat = lost and body is cooled when we sweat)
Gut/Colon
➽Excretes bile pigments and cholesterol formed in liver, in the form of faeces (mucus + bacteria also in faeces)
What is the function of the urinary system? And how does it carry out this function?
Maintain HOMEOSTATSIS by regulating: Volume + Concentration of body fluids.
How: By filtering + reabsorbing materials from 🩸
The two kidneys are found in the … … just below the…
Abdominal cavity
Diaphragm
The kidneys lie next to the… … on either side of the…
Posterior Wall
Vertebral Column
The kidneys lie next to the… … on either side of the…
Posterior Wall
Vertebral Column
The kidneys are kept in position by being attached to… … and…
Peritoneum
Renal blood vessels
Kidneys are made up of…
Nephrons
What is each nephron tubule made up of?
1.Renal corpuscle/Malpighian (in renal cortex)- Made up of:
Bowman’s capsule
+ Glomerulus
2.Renal Tubule -Made up of: Proximal convoluted tubule (in cortex)
+ loop of Henle (in medulla)
+ Distal convoluted tubule (in cortex)
Why does the kidney have to be supplied with blood?
It MAINTAINS homeostasis by removing unwanted substances from the blood.
How is the kidney supplied with blood?
1.Renal artery- carries blood rich in nitrogenous waste to the nephrons.
2.Renal vein- carries purified deoxygenated blood from kidney to IVC.
Sage 1 of functioning of kidney
Glomerular filtration
The fluid part of the blood is filtered from the glomerulus into the cavity of Bowman’s capsule.
Stage 2 of functioning of kidney
Tubular reabsorption
As this fluid flows along the renal tubule, useful substances are reabsorbed back into the bloodstream in the amounts required by the body.
