respiration Flashcards
how is energy we need supplied
through cellular respiration
what kind of reaction is respiration
exothermic - releases energy
how much does respiration take place
continually in all living cells
what happens in aerobic respiration
sugar glucose is reacted with oxygen gas, producing carbon dioxide and water, releasing energy
what is the equation for aerobic res
glucose+oxygen ———-> carbon dioxide + water
why does aerobic res release lots of energy
because the glucose molecule has been fully oxidised
when does anaerobic respiration happen
under some conditions where the amount of oxygen is limited so muscle cells respire anaerobically when theres a shortage of oxygen
what is the equation for anaerobic respiration
glucose——–>lactic acid
what happens during anaerobic respiration
glucose converts into lactic acid
it doesnt require oxygen.
why does an-resp release less energy than aer-respiration
oxidation of glucose is incomplete
lactic acid buildup
what is the equation for ana-resp in plant and yeast cells
glucose—–> ethanol + carbon dioxide
why does our body need a lot of energy for exercise and what does our body do for this
for muscle contraction we need a lot of energy
because we need a lot of energy aerobic res increases so the body cells require more oxygen
what increases to provide extra oxygen
3 pts
both breath rate and breathing volume increases
heart rate also increases to pump oxygenated blood around the body
what happens if not enough oxygen can be supplied
when not enough oxygen can be supplied to the muscles so anaerobic respiration takes place
what builds up during an.res and what does this cause
lactic acid builds up and causes muscles to become fatigued, causing the muscles to stop contracting efficiently
what does the body have to do to remove lactic acid
increase oxyen
what is oxygen debt
the amount of oxygen the body needs to remove lactic acid buildup from cells
how is lactic acid transported out
lactic acid is transported out of the muscles by the blood
where is the lactic acid taken and what happens here
the lactic acid is taken to the liver and converted back to glucose in a series of chemical reactions
what is metabolism
sum of all chemical reactions in a cell or the body
