1 Nostrils and nasal cavityii) Mucus-secreting cellstraps dust particles & moistens air mucus
1 Nostrils and nasal cavityiii) Ciliated epithelial cellsCilia sweep mucus with dustparticles towards pharynx cilia
1 Nostrils and nasal cavityiv) Capillaries •blood warms up air
Self Quiz! Which of the following structures is/are found in the nasal cavity? (1) ciliated epithelium (2) mucus-secreting cells (3) hairs A (1) only B (1) and (2) only C (1) and (3) only D (1), (2) and (3)
Self Quiz! The trachea is supported by many C- shaped cartilages. These cartilages A trap dust particles and bacteria. B warm up the inhaled air. C vibrate and produce sound. D keep the trachea open for breathing.
Self Quiz! Mucus in the respiratory tract helps (1) warm up the air. (2) moisten the air. (3) trap the dust particles in the air. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3)
4 Air sacs•large respiratory surface air sac capillary
5 Lungs•composed of bronchioles and air sacs•in thoracic cavity (胸腔)