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Respiration and Energy Release

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Questions and Answers

What is the primary energy source released during respiration?

Electrical energy

Mechanical energy

Thermal energy

Chemical energy (correct)

What is the byproduct of food oxidation during respiration?

CO2 (correct)

H2O

C6H12O6

What is the role of enzymes in respiration?

To oxidize respirable substances

To catalyze the oxidation-reduction process (correct)

To release energy from food

To reduce O2 to H2O

What is the ratio of absorbed O2 to liberated CO2 during respiration?

1:1 Signup and view all the answers

What happens when living cells respire in a closed system?

A vacuum is created Signup and view all the answers

What percentage of air is occupied by atmospheric O2 in a closed system?

20% Signup and view all the answers

Study Notes

Respiration Overview

Respiration is an energy-releasing process from food, involving oxidation-reduction of respirable substances like carbohydrates, proteins, and fats.
The process produces CO₂ and absorbs O₂, releasing chemical energy stored in the substances.

Respiration Reaction

C₆H₁₂O₆ (glucose) + O₂ → Energy + CO₂ + H₂O

Oxygen Absorption and CO₂ Liberation

Living cells respire continuously, absorbing O₂ and liberating CO₂ in a 1:1 ratio.
Absorbed O₂ is reduced to H₂O by accepting electrons (e⁻).

Respiratory Process in a Closed System

In a closed system, if living cells respire in the presence of atmospheric O₂, a vacuum will be created as O₂ is exhausted to produce CO₂.
The vacuum will not exceed 20% of the volume, as atmospheric O₂ occupies 20% of the air in the closed system.

Objectives

Study the respiration process in living cells.
Evaluate the absorption of O₂ and liberation of CO₂ during respiration.

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Description

This quiz demonstrates the process of respiration, where food is broken down to release energy, resulting in the absorption of oxygen and liberation of carbon dioxide. It covers the principles of cellular respiration and the role of enzymes in this process.