Cell respiration pt 1

cellular respiration

how cells obtain energy from organic molecules. Easy-to-use form of energy (ATP)

moving electrons=Redox reactions

electron transferred from molecule A to molecule B (sometimes H+ tags along too)

A loses an electron, B gains an electron

Molecule A is oxidized (reducing agent)

Molecule B is reduced (oxidizing agent)

redox reactions

can reduce energy

If electrons move closer to a more electronegative atom, they have lost potential energy

energy is released

cellular respiration (aerobic respiration)

harvests energy from glucose in a controlled, multi-step process (with lots of redox reactions)

eukaryotes

inner mitochondrial membrane

electron transport chain

passes along electrons, each step releases some energy-controlled release, final electron accepto is oxygen (O2) (makes H20/waste)

energy from ETC

pumps H+ against gradient into innermembrane space, creates higher concentration of H+, potentialenergy, H+ will try to flow DOWN gradient

chemiosmosis

using energy stored as a H+ gradient across the membrane to do cellular work. Enzyme ATP synthase makes ATP from ADP+ Pi as H+ ions pass through