Metabolism - Bioenergetics
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What is metabolism?
The sum of all reactions in a cell or body
What does a lipid molecule break down into?
• 3 fatty acids • 1 glycerol molecule
Name 5 metabolic reactions
• Glucose to cellulose in plants to strengthen cell walls • Glucose to glycogen in animal cells for storage • Formation of lipids froma molecule of glycerol and 3 moleucles of fatty acids • Break down of proteins to form urea for excretion • Respiration
What is a breakdwon reaciton?
Breaking down molecules
What’s a synthesis reaction?
Building and joining molecules to form something
Name 3 reactions where larger molecules are made from smaller ones
• Glucose molecules join together to make starch, glycogen, cellulose • Lipid molecules are each made from 1 molecule of glycerol and 3 fatty acids • Glucose is combined with nitrate ions to = amino acids which are made into proteins
Name 2 reactions where larger molecules are broken down to form smaller ones
• Glucose broken down in respiration. Res. transfers energy to power all the reactos in the body that make molecules • Excess proteins is broken down in a reaction that produces urea. Urea is excreted in urine
What is glycogen?
Storage form of glucose
What molecules are present in a lipid molecule to form what?
• 1 glycerol molecule • 3 fatty acid molecules • Lipid found in cell membrane
Why do you respire more when you excercise?
• Muscles need energy from respiration to contract • Energy comes from increased respiration • Breakthing arate and breath volume increaase to get more oxygen into the blood • Heart rate increases to get oxygenated blood around body faster - removes CO2 faster