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Dr.Hadeer

Egypt
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60-min

/h

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How the body's systems work to meet the needs of living organisms - Fourth Grade - First Semester

How the body's systems work to meet the needs of living organisms - Fourth Grade - First Semester

How do the body's systems work together? - The digestive system: It digests food and converts it into simple nutrients (glucose, amino acids, fatty acids) that reach the blood to nourish the cells. - The respiratory system: Oxygen enters the body and carbon dioxide exits, ensuring the continuation of cellular respiration within the cells. - The circulatory system (heart and blood vessels): It transports food and oxygen to all parts of the body, and removes waste products such as carbon dioxide and urea. - The excretory system (kidneys and skin): gets rid of waste products resulting from vital processes such as urine and sweat, in order to maintain the body's internal balance. - The nervous system: It regulates the functioning of different organs and sends signals to control movement and respond to external stimuli. - Muscular and skeletal system: Provides movement and support for the body, and helps protect internal organs. - The immune system: It defends the body against microbes and foreign substances, thus maintaining health. Summary Each system has a specific function, but the integration of these systems is what ensures human survival. Digestion provides food, respiration provides oxygen, blood circulation delivers both to the cells, excretion removes waste, and the nervous system coordinates all of this.

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