858604
Beschreibung
Karteikarten von abigaildawkins97, aktualisiert more than 1 year ago
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Erstellt von abigaildawkins97
vor mehr als 10 Jahre
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| Frage | Antworten |
| 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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