AMERICAN SCHOOL OF REYNOSA | 7TH GRADE BIOLOGY EXAM | MARCH 2023 Name: _______________________________________________ Date: ___________ Score: ____/40 I. Fill in the blanks; Use the words from the word bank below: Lungs Oxygen Inhale Alveoli Cilia 1. When we ____________________ air enters the body through the nose and mouth. 2. _______________________ and mucous work as a filter to trap dirt and germs from air. 3. The structure where the respiratory system and circulatory system meet is the ____________________ 4. _______________________ is necessary in all cells of the body. 5. The _______________________ are the main organs in the respiratory system. II. Explain the next questions: 6. Why people become addicted to smoking (cigarettes)? __________________________________________________________________________________________ __________________________________________________________________________________________ 7. The main function of the respiratory system is: __________________________________________________________________________________________ 8. What lung is slightly smaller? And why? __________________________________________________________________________________________ __________________________________________________________________________________________ 9. Explain how the gas exchange works: __________________________________________________________________________________________ __________________________________________________________________________________________ 10. Apart from Cancer, mention two diseases from the respiratory system: __________________________________________________________________________________________ II. True or False: Mark F if the statement is false. Or T if it is true. 11. When we breathe in, the diaphragm expands. __________________ 12. In the alveoli the CO2 enters the blood. ___________________ 13. The brain controls the breathing when we sleep. ____________________ 14. The nasal cavity and oral cavity are connected in the pharynx. ______________________ 15. Without the epiglottis food could get to the lungs. _____________________ III. Explain the respiration journey; the eight stages. __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________
