SOLUTIONS TO EXERCISES, LESSON 1
External respiration is the exchange of gases between the air in the lungs and
Internal respiration is the exchange of gases between the blood and the individual
cells of the body. (para 1-1b)
The larynx controls the volume of inflowing air and produces selected pitch
(vibration frequency) in the moving column of air. (para 1-2b(2))
Hairs in the nose filter inflowing air.
Auditory (eustachian) tubes.
The soft palate floor of the nasopharynx is a trapdoor that closes off the upper
respiratory passageways during swallowing. (para 1-3c(1))
Adam's apple and voice box.
The alveoli are tiny spherical (balloon-like) sacs that are connected to the larger
tubes of the lungs by alveolar ducts. (para 1-5b)
The left lung is smaller because it must leave room for the heart.
The mediastinum is found in the middle of the thorax, between the two pleural
cavities. (para 1-5d)
When the volume of the chest cavity decreases, the air pressure inside the lungs
increases and forces to flow out from the lungs. When the volume of the chest
cavity increases, the air pressure inside the lungs decreases and causes air to
flow in. (para 1-6a)
Muscles attached to the thoracic cage raise the rib cage during inhalation.