biology fod preserving

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  • Created by: RP
  • Created on: 20-05-14 17:43
what is the plasma
mainly water but contains glucose and other dissolved substances
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what are red blood cells
they are cells that have no nucleus so that they can carry haemoglobin. Haemoglobin carries oxygen in the blood and gives blood the red colour
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what are whtie blood cells
they are the defence system of the body. Phagocytes engulf and digest microbes and lymphocytes release antibodies to destroy microbes. They recognise the microbe to produce the right antibody to fit onto the antigen marker.
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what are platlets
platlets are small fragmets of cells useful to form clots to prevent excess bleeding
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From which vein to which artery does the blood flow in the left side of the heart
Pulmonary vein to aorta
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From which vein to which artery does that blood flow in the right side of the heart
Vena cava to pulmonary artery
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what are the blood pressure for each of the blood vessels
arteries - high, capillaries - low, veins - lowest
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how strong are each of the blood vessel walls
arteries - very strong that are thick and muscular, capillaries - one cell thick delicate and easily broken, vein - thin walls with less muscle and flexible so that blood can pass through.
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features of the alveoli
very thin walls to all gas to pass through, good supply of blood for maximum oxygen to enter the blood, large surface area the size of a tennis court, moist lining for dissolving gases.
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what are the two things that breathing is composed of.
ventilation - the act of inhaling oxygen and exhaling carbon dioxide and gas exchange - the exchange of gases in the alveoli
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what is the oxygen debt
The oxygen debt is where after doing lots of excercise and breathing anaerobically you have to breathe in lots of oxygen to change all the lactic acid formed in to carbon dioxide and water.
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the blood is needed for two reasons
transporting blood around the body and defending the body from pathogens.
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what is the difference between the pulmonary artery and the rest of the left side of the heart
the pulmonary artery carries de-oxygenated blood
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what is the difference between the pulmonary vein and the right side of the body
the pulmonary vein carries oxygenated blood
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5 modes of transmisson
contaminated food, sneezing and coughing on people, sucking your thumb, sexual intercourse, sharing drinks
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diseases NOT caused by microbes
cancer, heart disease and diabetes
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3 methods of preserving foods and the aim
canning, kill microorganisms at high temperatures and take away oxygen, freeze drying/smoking - slow down growth and remove water, preserving adding salt or acid to slow down growth where the conditions have now changed
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good uses of microbes
milk can change into yoghurt by adding the bacteria lactobacilius, yeat is used to make bread, microbes cause decay and help give plants nutrients, bacteria breaks down faeces
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what do viruses do to reproduce
they take over a cell and replicate inside
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what are the optimum conditions for microbes to grow
warmth, water, food ad oxygen
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Other cards in this set

Card 2

Front

what are red blood cells

Back

they are cells that have no nucleus so that they can carry haemoglobin. Haemoglobin carries oxygen in the blood and gives blood the red colour

Card 3

Front

what are whtie blood cells

Back

Preview of the front of card 3

Card 4

Front

what are platlets

Back

Preview of the front of card 4

Card 5

Front

From which vein to which artery does the blood flow in the left side of the heart

Back

Preview of the front of card 5
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