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B2.4

Energy from respiration

QuestionAnswer
word equation for aerobic respiration? glucose + oxygen ----> carbon dioxide + water (+energy)
respiration takes place? mitochondria
number of mitochondria in a cell shows? how active it is
respiration's function? energy warmth build large molecules from smaller ones, e.g. protein synthesis
more oxygen needed during exercise because? muscles contract more
changes in circulatory system during exercise? heart rate increases arteries supplying blood to muscles dilate (widen), allowing more O2 to get to muscles, and takes CO2 away.
2 effects of exercise more regularly? heart and lungs become larger more efficient blood supply
if muscles work too hard they? become fatigued and don't contract efficiently
anaerobic respiration occurs when? not enough O2 is supplied to the muscles
aerobic respiration produces more energy than? anaerobic respiration
O2 is still needed after exercise to? break down lactic acid into water and CO2
muscle fatigue is caused by? lactic acid build up
anaerobic respiration is less efficient because? glucose is not completely broken down
word equation for anaerobic respiration? glucose ----> lactic acid (+energy)
Created by: duane.humphreys