Chapter 9 Flashcards
what happens during aerobic respiration
glucose reacts with oxygen which transfers energy to cells
is aerobic respiration endo or exo thermic?
exothermic - energy is transferred to the environment via water
word equation for aerobic respiration
glucose + oxygen -> Carbon dioxide + water
symbol equation for aerobic respiration
C6 H12 O6 + 6O2 -> 6CO2 + 6H2O
where does aerobic respiration take place?
mitochondria
why do muscle cells have so many mitochondria
they need a lot of energy to work
3 main uses of respiration in animals
muscular activity
maintain internal body temperature
build or breakdown molecules
in plants what is respiration used for?
moves nutrients ions soil to root hair cells
what do muscles store glucose as?
glycogen
why do muscles store glycogen?
when you exercise, it is easy for the muscles to quickly transfer glycogen to glucose for respiration
why does your heart rate increase and arteries widen during exercise?
so more oxygenated blood can reach the muscles
body responses to exercise (3)
heart rate increases and arteries widen
breathing rate increases
glycogen in muscles is converted to glucose
why does your breathing rate increase during exercise?
there is more oxygen in your lungs and therefore in your blood so cells can respire
CO2 can also be exhaled quicker
what is anaerobic respiration?
when your body can’y supply enough oxygen to your muscles
why is anaerobic respiration inefficient?
the glucose is only partly broken down so far less energy is made
equation for anaerobic respiration
glucose -> lactic acid
what is an oxygen debt?
after exercise, you breathe heavily
this is because your body needs oxygen to react with and breakdown the lactic acid to turn it into carbon dioxide and water
equation for oxygen debt
lactic acid + oxygen -> carbon dioxide + water
what is fermentation?
anaerobic respiration in yeast cells
how is alcohol produced?
when yeast cells respire anaerobically, they produce ethanol (alcohol)
equation for anaerobic respiration in yeast
glucose -> ethanol + carbon dioxide
what is the metabolism?
the sum of all chemical reactions in the body
examples of metabolic reactions in the body (5)
respiration
photosynthesis
making amino acids from nitrate ions and glucose
formation of lipids from glycerol and fatty acids
conversion of starch to glycogen, starch and cellulose
metabolic reactions in the liver (3)
detoxifying substances like alcohol
passing break down products into blood so they can be excreted by kidneys
breaking down worn out blood cells and storing the iron to make new ones
