Biology
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- Created by: AOconnor
- Created on: 12-05-18 14:13
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- Biology
- Heart
- Vena cava moves deoxygenated blood from body into right atrium
- Pulmonary artery pumps deoxygenated blood to lungs
- Aorta moves oxygenated blood from lungs into left atrium
- Pulmonary vein pumps oxygenated blood around body
- Aorta moves oxygenated blood from lungs into left atrium
- Pulmonary artery pumps deoxygenated blood to lungs
- Valves prevent backflow
- RHR controlled by group of cells in right atrium that acts as pacemaker
- Artificial pacemakers
- Electrical devices used to correct irregularities in heart rate
- Artificial pacemakers
- Coronary heart disease
- Layers of fatty material build up inside coronary arteries and narrow them
- Heart valves can become fatty, and become faulty or develop a leak
- Faulty valve can cause stroke, heart failure and blood clots
- Heart valves can become fatty, and become faulty or develop a leak
- Stent keeps arteries open
- Statin reduces blood cholesterol levels and slow down rate of fat build up
- Layers of fatty material build up inside coronary arteries and narrow them
- Vena cava moves deoxygenated blood from body into right atrium
- Cancer
- Risk factors
- Smoking
- Obesity
- Exposure to UV
- Viruses
- Genes
- Caused by uncontrolled cell division
- Forms masses of cells called tumours
- Benign don't spread around body
- Malignant spread via blood to different body parts to form secondary tumours
- Forms masses of cells called tumours
- Risk factors
- Gaseous Exchange
- Blood pumped to lungs via pul. artery
- Gases diffuse in/out of blood
- Oxygenated blood sent to lungs via pul. vein
- Gases diffuse in/out of blood
- Blood pumped to lungs via pul. artery
- Repiration
- Aerobic: Glucose + Oxygen = CO2 + Water (+energy)
- Energy uses
- Chemical reaction to build large molecules
- Movement
- Keeping warm
- Energy uses
- Anaerobic: Glucose = Lactic acid (+energy)
- Fermentation
- Plant and yeast anaerobic: Glucose = Ethanol + CO2 (+energy)
- Aerobic: Glucose + Oxygen = CO2 + Water (+energy)
- Blood
- Plasma transports chemical substances
- White blood cells protect against infection
- Red blood cells
- Contain haemoglobin, reacts with oxygen to form oxyhaemoglobin
- no nucleus for more room for oxygen
- Bi-concave shape to increase s.a
- Blood vessels
- Arteries pump blood from heart to organs
- thick walls made from muscle and elastic fibres
- Veins pump blood from organs to heart
- thin walls and valves (prevent backflow)
- Capillaries allow substances to pass in/out of blood
- Narrow and thin wall (small diffusion path)
- Arteries pump blood from heart to organs
- Heart
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