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Define health
a state of physical and mental well-being
What is an enzyme?
A biological catalyst, usually proteins
Risk factors for coronary heart disease?
heart attack , death , pain
Veins have relatively thick walls and large lumen
artery's have thick walls and small lumen but a thick layer of muscle
Capillary's cell walls are a single cell thick with narrow lumen
How can coronary heart disease lead to a heart attack?
A build up of fatty material on the lining of vessels. If blood flow through coronary arteries is reduced supply of oxygen to heart is reduced
What is a carcinogen?
Agents that cause cancer or significantly increase the risk of developing cancer
Describe the 'lock and key theory' of enzyme action
The active site of an enzyme is structured to fit a specially shaped substrate. Once substrate binds to active site the enzyme will facilitate the reaction and release products of the reaction
What are the four components of blood?
Red blood cells
plasma
white blood cells
platelets
What is the function of red blood cells?
red blood cells carry oxygen from the lungs to all the cells in the body
What is the function of White Blood Cells?
Defend against infection
What is phagocytosis?
when some white blood cells change shape to eat unwelcome microorganisms
Red blood cells don't have a nucleus
What is the function of a platelet?
Blood clotting
Plasma is the liquid that carries everything in blood
Where in the heart are the pacemaker cells located?
upper part of the right atrium
Which chemical should be used to test for starch?
iodine solution
What happens when an enzyme is denatured?
The substrate will no longer fit into the enzymes
What does a Benedicts test test for?
sugars
What does the Biuret Test test for?
Proteins
What does the SudanIII Test test for?
Lipids
Red blood cells contain a red pigment called?
Haemoglobin
What is biles function?
Bile neutralizes the stomach acids and emulsifies fats
Where is bile produced?
In the liver