Respiratory System

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Cellular respiration, the making of ATP by mitochondria, is the last of a four-part sequence of processes related to the body’s treatment and use of oxygen. The first is breathing, which consists of inhaling (inspiration) and exhaling (expiration). Inhaling gets the oxygen into the lungs. Gases are exchanged between the blood and the lungs; oxygen goes into the blood and carbon dioxide comes out, a process called external respiration. This is contrasted to internal respiration, which is gas exchange between the blood and tissues in order to deliver oxygen to cells and remove carbon dioxide. Once the cells have the oxygen, their mitochondria conduct cellular respiration, producing CO2 as a waste product that must be excreted. The Respiratory System biology study guide unit deals thoroughly with the first three of these processes—those that transport oxygen to cells for cellular respiration.

Respiratory System is excerpted from our Biology 12 Study Guide, which is the sixth edition of a student study guide written to match the curriculum of British Columbia. The concepts presented are applicable to the biology curricula of other educational jurisdictions as well.

As with each of the biology study guide units in this series, this unit contains:

  • Biological terms linked to a Glossary where they are carefully and contextually defined
  • Biological names in the Glossary linked to a useful Taxonomic Guide
  • Diagrams that display fullscreen views when double-tapped
  • Quiz-view formats of many diagrams in the enhanced version
  • Sets of Concept Check-up questions dispersed in the unit that are linked to their answers
  • Sets of Discussion Questions dispersed in the unit designed to challenge you as you work through it
  • A concluding set of Check Your Understanding of Concepts multiple choice questions linked to their answers
  • A set of Build Your Understanding questions designed to push you beyond the limitations of this unit.

Note: Discussion Questions and Build Your Understanding questions are not linked to their answers.