Circulatory System

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Full appreciation of the circulatory system requires an understanding of the structural and functional relationships of its components. Physically, it is a transportation route for blood tissue through the body that is used by the respiratory system to deliver oxygen, by the digestive system to deliver nutrients, and by the excretory system to prevent metabolic wastes from accumulating in tissue spaces. All cells of the body are serviced by the circulatory system in these ways during the process of capillary-tissue fluid exchange.

The source of the pressure that pushes the blood is the heart, a miraculous organ that responds automatically to the needs of the body. Blood has to pass through the heart twice for each complete circuit of the body, because every time it passes through a capillary bed, blood pressure is much diminished.

The Circulatory System biology study guide unit examines the structures of the heart and blood vessels and how they function together, as well as the composition of the blood and its various types of cells. The fetal circulatory system is considered, along with the changes to that circulatory pattern which have to occur at birth once the lungs become functional. The lymphatic system’s close association with the circulatory system is also presented.

Circulatory 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.