Breathing

Question 1

Describe the main features of alveoli

Answer 1

Type 1 cells (squamous epithelial)
Type 2 cells (surfactant secreting)
Alveolar pores
Macrophages

Question 2

Define Boyle’s Law

Answer 2

The proportional relationship between Volume and Pressure

Question 3

Define Dalton’s Law

Answer 3

Total pressure of a mixed gas is the sum of the pressures of the individual gasses in it

Question 4

Define Henry’s Law

Answer 4

Quantity of gas dissolved in a liquid is a function of the gasses partial pressure and the gasses solubility constant (k)

Question 5

If Arterial P CO2 increases, what happens?

Answer 5

The increase in CO2 decreases the pH of the brains extracellular fluid

Central Chemoreceptors in the brain detect increase in H+
Peripheral chemoreceptors in the carotid and aortic bodies detect increase in P CO2

Afferent impulses sent to Medullary respiratory centers

Efferent impulses sent to respiratory muscle

Ventilation is increased (More CO2 exhaled)

Arterial P CO2 decreases