Excretion- example of homeostatic control 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelOCR Created by: laelle1479Created on: 15-01-17 20:47 What is excretion? The removal of metabolic waste (unwanted substances) from the body 1 of 12 What is metabolic waste? A substance produced in excess by metabolic process- that may become toxic 2 of 12 What is secretion? The removal of wanted substances out of cells 3 of 12 What products must be excreted? Carbon dioxide, nitrogen containing compounds (e.g. urea) + bile 4 of 12 What are liver cells called? Hepatoyctes 5 of 12 Why must waste products be excreted? Because the build-up of them is toxic and can be fatal 6 of 12 How can waste products interfere with metabolism? The alter pH levels and some act as enzyme inhibitors 7 of 12 What does the hepatic artery do? Brings oxygenated blood from the (via aorta) to hepatocytes for aerobic respiration and production of ATP 8 of 12 What does the hepatic portal vein do? Brings deoxygenated blood from the digestive system containing digestive products and toxic compounds (e.g. alcohol) to the liver 9 of 12 What does the hepatic vein do? Takes deoxygenated blood away from the liver, rejoining the vena cava 10 of 12 What does the bile duct do? Carries bile produced by the liver to the gall bladder where its stored for digestion 11 of 12 Why do hepatocytes need ATp? For metabolic processes 12 of 12
Comments
No comments have yet been made