2273958
Description
Flashcards by Charlotte Hewson, updated more than 1 year ago
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Created by Charlotte Hewson
over 9 years ago
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| Question | Answer |
| why to larger organisms need a transport system? | surface area to volume ratio decreases so gas cant be diffused in any longer, there has to be a system. |
| what determines whether there is a specialised system? | -SA:V -how active the organism is |
| what features give the greatest need for a specialised transport system? | lower SA:V ratio and active e.g. a mouse |
| what are 6 features of transport systems? | -suitable medium to carry materials (blood) -form of mass transport -closed system -mechanism to move the medium (heart or evaporation in plants) -way to keep flow one way (valves) -controlling flow to suit changing needs |
| what are the three types of blood vessel? | arteries veins capillaries |
| which vessel takes blood from the right ventricle to the lungs? | pulmonary artery |
| which vessel takes blood from the lungs to the left atrium? | pulmonary vien |
| which vein takes de-oxygenated blood into the right atrium? | vena cava |
| which artery takes oxygenated blood from the left ventricle to the rest of the body? | the aorta |
| which artery takes blood to the kidneys? | renal artery |
| which artery supplies the liver? | hepatic artery |
| which vessel takes blood from the stomach and intestines to the liver? | hepatic portal vein |
| Which vessel takes blood from the kidney to join the vena cava? | renal vein |
| which blood vessel goes from the liver to join the vena cava? | hepatic vein |
| A transport system moves substances long distances. how are these substances then moved into the cells? | diffusion |
| what 3 things make the diffusion of substances into cells rapid? | -large surface area -across short distances -steep diffusion gradient |
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