The movement of water molecules from an area of high concentration to an area of low concentration across a partially permeable membrane
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Four ways the alveoli's structure is ideal for gas exchange?
thin moist lining for dissolved gases, large surface area, good blood supply and only one cell thick (increase diffusion)
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How does the structure of the villi make it good for it's job?
vast network of blood capillaries so there is quick absorption, large surface area faster absorption of digested food and a layer of surface cells
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Define homeostatis
maintenance of constant internal environment
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Four things the body needs to keep constant
blood sugar levels (glucose), water content, ion content and body temperature
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What temperature do enzymes work best at in the body?
37 degrees Celsius
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Why do arteries need muscular walls and elastic fibres?
to make them strong, and be able to stretch and spring back because blood is pumped out the blood at high pressure
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Advantages and disadvantages of kidney transplant?
advantages - permenant, less self-monitoring and no restricted diet Disadvantages - infection from donor kidney, rejection, low success rate, use of imunosupressive drugs with costly side effects
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Evaporation from leaves - conditions
windy, hot, dry
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What causes type 1 diabetes
pancreas produce little or no insulin controlled by insulin injections or reduced carbs in foods
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Three ways water is lost from the body
breathing, urine and sweat
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what does a stent do?
keeps artery open so blood can flow through, reducing risk of heart attack
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Define active transport
movement of particles against the concentration gradient and needs energy from resipration
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Substance in red blood cells called?
HAEMOGLOBIN
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Other cards in this set
Card 2
Front
Four ways the alveoli's structure is ideal for gas exchange?
Back
thin moist lining for dissolved gases, large surface area, good blood supply and only one cell thick (increase diffusion)
Card 3
Front
How does the structure of the villi make it good for it's job?
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