شرح ساينس الصف الرابع الابتدائي لغات - الفصل الدراسي الأول
شرح ساينس رابعة ابتدائي - ترم أول

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In This Part :
Respiratory System
- The respiratory system is the system responsible for breathing (respiration).
- The respiratory system supplies the body with oxygen gas and gets rid of carbon dioxide gas through the respiration process.

Respiration process
It is a process of entering the air carrying oxygen into the body and pushing the air carrying carbon dioxide out of the body

Human respiratory system
How does the respiratory system work?
How does the respiration process take place?
Respiration process includes:
1. Inhalation (breathe in).
2. Exhalation (breathe out).

Inhalation and exhalation are directed by a large muscle at the base of the ribs called the diaphragm.

Comparison between inhalation and exhalation:

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