Cellular Respiration

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Metabolism Noun

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[muh-tab-uh-liz-um]

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Metabolism

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The set of all chemical reactions occurring in the cells of living organisms to sustain life and its processes.

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Example: This image shows how our bodies turn food (glucose) and oxygen into usable energy (ATP), which is a key part of metabolism.

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Digestive System Noun

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[dy-jes-tiv sis-tuhm]

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Digestive System

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The body system responsible for breaking down food into smaller molecules that can be absorbed and used by the body.

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Example: This diagram shows the main organs of the human digestive system, which work together to break down food for energy and nutrients.

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Respiratory System Noun

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[res-per-uh-tor-ee sis-tuhm]

Back

Respiratory System

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The network of organs and tissues responsible for taking in oxygen from the air and expelling carbon dioxide waste.

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Example: This diagram shows the main organs of the respiratory system, including the nasal cavity, trachea, lungs, and the diaphragm muscle used for breathing.

Front

Circulatory System Noun

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[sur-kyuh-luh-tor-ee sis-tuhm]

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Circulatory System

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The body system that transports oxygen, nutrients, and other substances to cells and carries away waste products via blood.

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Example: This diagram shows how the heart pumps deoxygenated blood (blue) to the lungs to get oxygen, and then circulates that oxygenated blood (red) throughout the body.

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Glucose Noun

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[gloo-kohs]

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Glucose

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A simple sugar molecule that serves as a primary source of energy for cells through the process of cellular respiration.

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Example: This image shows the chemical structure of a glucose molecule, detailing the arrangement of carbon (C), hydrogen (H), and oxygen (O) atoms.

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Oxygen Noun

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[ok-si-jin]

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Oxygen

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A chemical element and gas molecule required by cells to react with glucose to release energy during cellular respiration.

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Example: This image shows oxygen as bubbles, labeling it with its name and its chemical formula, O₂, which is the form of oxygen we breathe.

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Cellular Respiration Noun

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[sel-yuh-ler res-puh-rey-shuhn]

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Cellular Respiration

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The metabolic process inside cells where glucose and oxygen are converted into usable energy, carbon dioxide, and water.

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Example: This diagram shows that cells use glucose (sugar) and oxygen to produce energy (ATP), releasing carbon dioxide and water as byproducts.

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Molecules Noun

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[mol-i-kyoolz]

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Molecules

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A group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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Example: This image shows that a molecule, like water (H₂O), is made of smaller parts called atoms (two Hydrogen and one Oxygen) joined together.

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Energy Noun

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[en-er-jee]

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Energy

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The capacity to do work, released from chemical reactions like cellular respiration, which powers all of life's processes.

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Example: This diagram shows how cells use food, like rice, to make usable energy called ATP inside an organelle called the mitochondrion.

Front

Carbon Dioxide Noun

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[kar-buhn dy-ok-sahyd]

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Carbon Dioxide

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A molecule composed of carbon and oxygen, produced as a waste product of cellular respiration and expelled by the body.

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Example: This image shows a simple model of a carbon dioxide molecule, made of one carbon and two oxygen atoms, along with its chemical formula, CO₂.