Respiration

Question 1

What is the effect of the SNS on the lungs?

Answer 1

Increases breathing rate by increasing the resistance of flow into the lungs due to constriction of the pulmonary veins and vessels, bronchial tubes also widen

Question 2

What is the effect of the PSNS on the lungs?

Answer 2

Slows breathing rate by contracting bronchial tubes and widening pulmonary blood vessels

Question 3

In both the sympathetic and parasympathetic system, what receptors are stimulated or inhibited in the lungs?

Answer 3

Pulmonary stretch receptor

Question 4

What are the two airways that split up the mammalian lungs, give the parts involved and a definition of what occurs here?

Answer 4

Conduction zone
- trachea, primary bronchi, secondary bronchi, bronchioles
- no gas exchange occurs here, just gas being conducted in and out of lungs

Respiratory zone
- alveoli
- where gas exchange occurs between alveoli and pulmonary capillaries

Question 5

Conducting zone functions:
Trachea
Primary Bronchi
Secondary Bronchi
Bronchioles

Answer 5

Trachea: allows the passage of inspired and expired air in and out of the lungs
Primary Bronchi: moisturise air and screen for pathogens
Primary, Secondary, Bronchioles: conduction of air