Question

The table contains statements about three stages of respiration. Determine whether each statement is true for each stage of respiration in an animal:

A) Tick (True)
B) Cross (False)

Answer 1

Food entering the lungs is prevented through the closure of the epiglottis and the movement of the larynx. The lungs receive oxygenated blood. Gas exchange occurs only in the alveoli of the lower respiratory tract. Coughing can expel mucus and irritants from the respiratory tract.

Step-by-step explanation:

1. True. The epiglottis closes over the trachea (windpipe) during swallowing to prevent food and liquid from entering the lungs, and the larynx (voice box) moves up to close off the entry to the trachea.
2. True. The lungs receive oxygenated blood from the pulmonary arteries, which carry blood from the heart to the lungs for oxygenation.
3. False. Gas exchange only occurs in the respiratory zone of the lower respiratory tract, specifically in the alveoli.
4. True. Coughing can expel mucus, foreign particles, and irritants from the respiratory tract.