1. Food descends from the mouth to the stomach through a muscular tube known as _______.   Hint First letter clue   2. Heart is divided into _______ chambers.   First letter clue   3. Heart lies on the left side of the _______ cavity.   First letter clue   4. _______ is the opening in the body through which feces are excreted.   First letter clue   5. Kidneys are the main _______ organs.   First letter clue   6. Blood is returned to the heart from various body parts through blood vessels known as _______.   First letter clue   7. Blood is distributed to various parts of the body through blood vessels known as _______.   First letter clue   Skip to Diagrammatic repr... ⇒