1. _______ is a muscular leaf-like structure helpful in swallowing of food and speaking.   Hint First letter clue   2. _______ are the main respiratory organs.   First letter clue   3. Kidneys are the main _______ organs.   First letter clue   4. Heart is divided into _______ chambers.   First letter clue   5. Oral cavity remains moist due to presence of a fluid known as _______.   First letter clue   6. A healthy human adult has _______ bones.   First letter clue   7. Blood is returned to the heart from various body parts through blood vessels known as _______.   First letter clue   Skip to Diagrammatic repr... ⇒