BIOLOGY UNIT 3a GCSE

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Flashcards by abigaildawkins97, updated more than 1 year ago
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Created by abigaildawkins97 over 7 years ago
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Flashcards on BIOLOGY UNIT 3a GCSE, created by abigaildawkins97 on 05/11/2014.

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Question Answer
Osmosis movement of water molecules across partially permeable membrane from a region of high concentration to low concentration
Substances move by diffusion, Osmosis and Active transport
what does stomata allow to diffuse through Carbon Dioxide
the size of the stomata are controlled by Guard Cells
where are the lungs Thorax (top part of body)
Ventiliation IS breathing in and breathing out
gas exchange happens in the lungs
job of lungs transfer oxygen to the blood and to remove waste carbon dioxide
alveoli Are little air sacs in the lungs where gas exchange takes place
Alveoli have : large surface area moist lining thin walls good blood supply
villi inside of the small intestine
villi have large surface area single layer of surface cells good bloody supply to assist quick absorption
root hairs are specialised for Water and Minerals
root hair take in minerals by using : Active Transport
Active transport NEEDS: ENERGY from respiration
Phloem tubes Transport food (transport in both directions)
Xylem tubes Take Water UP (and minerals)
transpiration is the LOSS of water from the plant (caused by evaporation and diffusion)
Arteries carry blood AWAY from the heart
Capillaries Invovled in the exhnge of materials at the tissues
Veins Carry blood TO the heart
RED blood cells Carry OXYGEN (large surface area for absorption)
WHITE blood cells Defend Against disease/microorganisms
Platelets help blood clot
plasma Carries everything in the blood
stents keep arteries open
Homeostasis is the maintenance of a constant internal environment
homeostasis controls temperature, water content, ion content, blood sugar levels, carbon dioxide, urea
thermoregulatory centre in the brain which acts as personal thermostat
When your TOO HOT 1. Hairs lie flat 2. sweat is produced by sweat glands 3. blood vessels supplying the skin dilate so more blood flows
When your TOO COLD 1. hairs stand up to trap insulation layer 2. no sweat is produced 3.close off skins blood supply 4. shiver
Kidneys 3 main roles : 1. removal of urea 2. adjustment of ions 3. adjustment of water content
nephrons are the filtration units in the kidneys
what controls blood glucose level Insulin and Glucagon
type 1 diabetes is caused by Lack of insulin
insulin reduces blood glucose levels
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