CHP 10: Respiratory System

Question 1

List in order the organs of the respiratory system.

Answer 1

Nose
Nasal cavity
Pharynx
Larynx
Trachea
Bronchi
Bronchioles
Lungs

Question 2

What is the function of the nose?

Answer 2

Serves as the nasal epithelium

Question 3

What is the function of the pharnyx?

Answer 3

Warms, filters, and humidifies incoming air

Question 4

What is the function of the larynx?

Answer 4

Voicebox that closes during swallowing

Question 5

What is the function of the trachea?

Answer 5

Wind pipe

Question 6

What is the function of the bronchi?

Answer 6

The airway that enters the lung

Question 7

What is the function of the alveoli?

Answer 7

Tiny air sacs at the end of the bronchioles that allow for rapid gas exchange.

Question 8

What is the function of the lungs?

Answer 8

Organ of that performs the process of respiration.

Question 9

List the steps involved for quiet breathing.

Answer 9

Signal from CNS thru phrenic and external intercostal nerves reaches diaphragm and external intercostal muscles. Volume increases in thoracic cavity as pressure decreases. The air moves from high pressure area to low pressure area. O2 is exchanged for CO2 in alveoli. The signals from the CNS stop and breathing muscles relax. Volume decreases, pressure increases and air moves from alveoli to the atmosphere with CO2.

Question 10

Describe the controls over breathing.

Answer 10

The respiratory center in the brain stem’s medulla is the pacemaker for respiration. It sends signals over nerve pathways for breathing muscles to contract. Carbon dioxide is the main trigger that controls breathing rate and depth.