13. Which of the following statements best describes the
function of the digestive system?
A. It releases acids and mixes food.
B. It aids in absorption of nutrients from food.
C. It carries food from stomach to the intestine.
D. It breaks down food so that the body can
absorb food nutrients.
14. Which part of the respiratory system where air,
water, and food pass through?
A. larynx
B. trachea
C. pharynx
D. epiglottis
15. What is the main organ of the respiratory system?
A. alveoli
B. bronchi
C. diaphragm
D. lungs
16. These are small pouches or sacs in the lungs where
exchange of carbon dioxide and oxygen takes place.
A. bronchial tube
B. nostrils
C. alveoli
D. nasal cavity
17. Which part of the circulatory system carries blood
throughout the body?
A. blood vessels
B. heart
C. blood
D. veins
18. It is the pumping organ of the circulatory system.
A heart
B. blood
C. blood vessels
D. veins​