What are the inputs and outputs of the electron transport chain and chemiosmosis?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### What are the inputs and outputs of the electron transport chain and chemiosmosis?

#### Inputs:
1. **NADH** - Nicotinamide adenine dinucleotide (from glycolysis, pyruvate oxidation, and the citric acid cycle).
2. **FADH2** - Flavin adenine dinucleotide (from the citric acid cycle).
3. **Oxygen (O2)** - Final electron acceptor.

#### Outputs:
1. **ATP** - Adenosine triphosphate, the main energy currency of the cell, produced during chemiosmosis.
2. **Water (H2O)** - Formed when oxygen accepts electrons and combines with protons (H+).

#### Process Overview:
The electron transport chain (ETC) and chemiosmosis are part of cellular respiration, occurring in the mitochondria. Electrons from NADH and FADH2 are transferred through a series of proteins in the inner mitochondrial membrane. Energy released from these reactions is used to pump protons across the membrane, creating a proton gradient. Through chemiosmosis, protons flow back into the mitochondrial matrix via ATP synthase, driving the synthesis of ATP.

(Note: For a more detailed explanation, diagrams and graphs showing the electron transport chain and chemiosmosis can be very helpful for visualizing these processes.)
Transcribed Image Text:### What are the inputs and outputs of the electron transport chain and chemiosmosis? #### Inputs: 1. **NADH** - Nicotinamide adenine dinucleotide (from glycolysis, pyruvate oxidation, and the citric acid cycle). 2. **FADH2** - Flavin adenine dinucleotide (from the citric acid cycle). 3. **Oxygen (O2)** - Final electron acceptor. #### Outputs: 1. **ATP** - Adenosine triphosphate, the main energy currency of the cell, produced during chemiosmosis. 2. **Water (H2O)** - Formed when oxygen accepts electrons and combines with protons (H+). #### Process Overview: The electron transport chain (ETC) and chemiosmosis are part of cellular respiration, occurring in the mitochondria. Electrons from NADH and FADH2 are transferred through a series of proteins in the inner mitochondrial membrane. Energy released from these reactions is used to pump protons across the membrane, creating a proton gradient. Through chemiosmosis, protons flow back into the mitochondrial matrix via ATP synthase, driving the synthesis of ATP. (Note: For a more detailed explanation, diagrams and graphs showing the electron transport chain and chemiosmosis can be very helpful for visualizing these processes.)
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