Explain Energy Release in Respiration - Biology

Net 2 ATP. Uses 2 ATP but produces 4 ATP, giving net gain of 2.

Acetyl-CoA, $CO_2$, and NADH. Pyruvate loses carbon as $CO_2$ and forms acetyl-CoA.

To generate NADH and FADH$_2$ and release $CO_2$. Completes glucose oxidation and produces electron carriers.

ATP-producing breakdown of organic molecules, usually using oxygen. Converts glucose into usable ATP energy through oxidation.

ATP-producing breakdown of organic molecules, usually using oxygen. Converts glucose into usable ATP energy through oxidation.

glucose + oxygen → carbon dioxide + water (+ ATP). Glucose + oxygen react to produce ATP, carbon dioxide, and water.

$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$ (+ ATP). Balanced equation showing 6 $O_2$ needed for complete glucose oxidation.

Energy stored in glucose chemical bonds, especially C–H bonds. High-energy bonds store energy that can be released during oxidation.

Electrons are transferred to lower-energy acceptors in redox reactions. Energy is released as electrons move to lower energy states.

Glucose is oxidized to carbon dioxide. Glucose loses electrons and hydrogen to become $CO_2$.

Oxygen is reduced to water. Oxygen gains electrons to form water at the end of the ETC.

ATP. Universal energy carrier that powers cellular work.

Cytosol. First stage occurs in the cell's cytoplasm.

Synthesizes ATP from ADP and inorganic phosphate using a proton gradient. Uses proton flow to drive phosphorylation of ADP.

Mitochondrial matrix. Pyruvate is oxidized inside the mitochondrial matrix.

Mitochondrial matrix. Acetyl-CoA is processed in the mitochondrial matrix.

Inner mitochondrial membrane (cristae). Folded inner membrane provides surface area for electron transport.

To split glucose into pyruvate and produce some ATP and NADH. First stage that partially breaks down glucose for energy.

2 pyruvate, 2 NADH, and net 2 ATP. One glucose produces two pyruvate molecules and energy carriers.

It donates a 2-carbon acetyl group to start the Krebs cycle. Acetyl group enters Krebs cycle to complete glucose oxidation.

3 NADH, 1 FADH$_2$, 1 ATP (or GTP), and $2CO_2$. One acetyl-CoA produces multiple electron carriers and ATP.

NADH and FADH$_2$. Electron carriers transport high-energy electrons for ATP production.

Transfers electrons and pumps $H^+$ to build a proton gradient. Creates proton gradient that drives ATP synthesis.

Oxygen ($O_2$). Final electron acceptor that allows ETC to continue running.

ATP formation by direct phosphate transfer from a substrate to ADP. Direct phosphate transfer without electron transport chain.

ATP production driven by the electron transport chain and chemiosmosis. Uses electron transport and proton gradient for ATP synthesis.

ATP synthesis powered by $H^+$ flow down an electrochemical gradient. Proton gradient drives ATP synthesis through ATP synthase.

ETC stops; oxidative phosphorylation stops; ATP yield drops sharply. No oxygen means electron transport and chemiosmosis stop.

Water ($H_2O$). Oxygen accepts electrons and combines with protons.