1. Heart lies on the left side of the _______ cavity.   Hint First letter clue   2. Bronchi are _______ in number.   First letter clue   3. Blood is returned to the heart from various body parts through blood vessels known as _______.   First letter clue   4. _______ is a tubular structure through which urine is excreted out of the body.   First letter clue   5. Kidneys are the main _______ organs.   First letter clue   6. Heart is divided into _______ chambers.   First letter clue   7. Salivary glands secrete a fluid known as _______ which helps in digestion as well as in swallowing of food.   First letter clue   Skip to Diagrammatic repr... ⇒