1. Food descends from the mouth to the stomach through a muscular tube known as _______.   Hint First letter clue   2. _______ are the main respiratory organs.   First letter clue   3. _______ is the opening in the body through which feces are excreted.   First letter clue   4. _______ is the organ of smell.   First letter clue   5. Blood is returned to the heart from various body parts through blood vessels known as _______.   First letter clue   6. Salivary glands secrete a fluid known as _______ which helps in digestion as well as in swallowing of food.   First letter clue   7. Oral cavity remains moist due to presence of a fluid known as _______.   First letter clue   Skip to Diagrammatic repr... ⇒