BIOLOGY SSS 2 FIRST TERM

WEEK SEVEN

MECHANISM OF THE RESPIRATORY SYSTEM

PERFORMANCE OBJECTIVE

Students should be able to;

1. Explain the respiratory system in some animals - Mammals

CONTENT

All living things obtain the energy they need by metabolizing energy-rich compounds, such as carbohydrates and fats. In the majority of organisms, this metabolism takes place by respiration, a process that requires oxygen. In the process, carbon dioxide gas is produced and must be removed from the body. In-plant cells, carbon dioxide may appear to be a waste product of respiration, too, but because it is used in photosynthesis, carbon dioxide may be considered a by-product. Carbon dioxide must be available to plant cells, and oxygen gas must be removed. Gas exchange is thus an essential process in energy metabolism, and gas exchange is an essential prerequisite to life, because where energy is lacking, life cannot continue.

The basic mechanism of gas exchange is diffusion across.... View More