The Excretory System - Waste Removal and Kidney Function — العلوم الصف السادس الابتدائي لغات

الدرس ده من وحدة «Unit 1: What Is a System?» فى مادة العلوم لـالصف السادس الابتدائي لغات على منصة دروسات.

الدرس متاح بالاشتراك: ترم كامل أو المادة لوحدها.

ملخص الدرس

This lesson explains the vital physiological role of the excretory system in maintaining homeostasis by filtering and expelling toxic metabolic by-products. It examines the urinary system (kidneys, nephrons, ureters, urinary bladder, urethra), the skin's sweat glands, and the lungs, distinguishing true cellular excretion (urea, $CO_2$, sweat) from digestive defecation.

هتتعلم إيه فى الدرس ده

• Excretion is the removal of cellular metabolic wastes (urea, $CO_2$, sweat) to prevent internal toxicity.
• The urinary system filters blood via ~1 million nephrons per kidney, producing urine.
• Urine travels: Kidneys $\rightarrow$ Ureters $\rightarrow$ Urinary Bladder $\rightarrow$ Urethra.
• Skin excretes sweat for cooling and waste removal; lungs excrete $CO_2$; solid feces is digestive elimination.