1. Breathing rate is controlled by specialized nerve cells called:
a) intercostals muscles
b) chemoreceptors
c) diaphragm
d) villi

2. A respiratory disease in which there is a spontaneous contraction of the bronchioles reducing air flow is
a) asthma
b) tuberculosis
c) bronchitis
d) emphysema

3. The amount of air that enters of leaves the lungs during a normal respiratory cycle is
a) tidal volume
b) vital capacity
c) total lung capacity
d) residual volume

4. The part of the respiratory system that acts like running socks to prevent friction on the lungs and ensure that the lungs inflate is:
a) thoracic cavity
b) pleural membrane
c) bronchi
d) diaphragm

5. What is the definition of vital capacity?
a) amount of air that enters or leaves the lungs during a normal during a normal respiratory cycle
b) volume of air that can be exhaled form the lungs by maximum exhalation after maximum inhalation
c) volume that always remains in the lungs after maximum exhalation
d) maximum quantity of air that can be expelled from the lungs