Biology 3rd Secondary Egypt - Chapter 4 - Lesson 3 - P1 (First Line of Defense)

This video is intended to explain biology for 3rd secondary / senior 3 stage in Egypt. Please neverminded the following keywords: biology 3rd secondary Egypt biology 3rd secondary biology 3rd sec biology 3rd sec Egypt biology 3rd secondary chapter 4 lesson 3 biology 3rd secondary support in living organisms 3rd sec biology 3rd sec biology 2nd term chapter 4 lesson 3 part 1 3rd secondary biology third secondary biology 3rd secondary biology chapter 4 lesson 3 3rd secondary biology support in living organisms biology third sec biology biology 3rd sec second term Egypt biology 3rd secondary Egypt chapter 4 lesson 3 senior 3 biology --------------------------------------------------------- 📢To communicate with me: WhatsApp -- 0101 151 4985 Facebook page -   / thebiochannel   ❤ Channel Support: Vodafone Cash: 0101 151 4985 --------------------------------------------------------- Guiding Time stamps: 00:00 - Introduction 10:30 - First Line of Defense 13:33 - 1- Skin 17:36 - 2- Cerumen (Ear Wax) 18:28 - 3- Tears 19:53 - 4- Mucus of Respiratory Tract 22:30 - 5- Saliva 23:07 - 6- Acidic Gastric Juice (Secretions) If you have any questions, feel free to ask in the comments! ^^