Biology Topic 2
- Created by: em3fr
- Created on: 18-03-19 19:36
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- Biology T2
- Enzymes
- Enzymes are catalysts created by living things
- They have special shapes to catalyse
- They need the right temperature and pH
- Enzymes are catalysts created by living things
- Food Tests
- Benedicts - Sugars
- Iodine - Starch
- Biuret - Proteins
- Sudan 3 - Lipids
- The Lungs
- Air goes through trachea then splits into bronchi
- Bonchi develop into bronchioles then alveoli
- Alveoli carry out gas exchange - Swapping of oxygen into blood, and CO2 into lungs - diffusion
- The heart
- Contracts to pump blood around the body
- Has a pace maker that contract the heart using electric impulses
- Left and right atrium and ventricles
- Contracts to pump blood around the body
- Blood Vessels
- Arteries - carry blood under pressure. - strong and elastic
- Capillaries - really small and carry blood close to cells to exchange substances- the wall, thin lumen
- Veins - take blood back to heart - large lumen, elastic
- Blood
- Red blood cells - carry oxygen. Have no nucleus and biconcave dis to carry more oxygen
- White blood cells defend infections
- Platelets help blood clot
- Plasma - carries everything
- Red blood cells - carry oxygen. Have no nucleus and biconcave dis to carry more oxygen
- Cardiovascular disease
- Stents - keep arteries open
- Statins - reduce cholesterol in the blood
- Has to be taken regularly
- Health and disease
- Diseases can interact e.g. problems with immune system leads to other diseases
- Smoking, poor diet and stress can affect your health
- Cancer
- Malignant - cancerous - tumour grows and affects other cells
- Smoking, obesity, UV exposure and infection can cause cancer
- Benign - non cancerous - tumour grows until no more room and doesn't spread
- Smoking, obesity, UV exposure and infection can cause cancer
- Benign - non cancerous - tumour grows until no more room and doesn't spread
- Malignant - cancerous - tumour grows and affects other cells
- Enzymes
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