February 2025

The respiratory system and gaseous exchange

By |2025-02-12T09:34:21+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Human respiratory system. Image credit anatrik.org Human respiratory system. Image credit anatrik.org ZIMSEC O Level Combined Science Notes: The respiratory system and gaseous exchange

  • The respiratory system is responsible for gaseous exchange and breathing so that oxygen is taken into the body and carbon dioxide is released from the body.
  • Mammals including […]
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Respiration

By |2025-02-12T09:36:04+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Respiration

  • During the gaseous exchange process oxygen is taken into the body and carbon dioxide is expended.
  • Oxygen is needed to burn fuels to release energy.
  • Food is a fuel and oxygen is used by th cells to “burn” the fuel.
  • The burning process is very slow and there are not flames involved.

    • […]

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Experiment: Do plants release carbon dioxide when they respire?

By |2025-02-12T09:45:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Potted plant. Image credit artificialplantsandtrees.com Potted plant. Image credit artificialplantsandtrees.com ZIMSEC Combined Science Revision Notes: Do plants release carbon dioxide when they respire?

Aim: To determine whether all living things, including plants, release carbon dioxide when they respire.

Materials: bell jar or a large container, 3 boiling tubes/flasks glass or rubber tubing, lungs, suction […]

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