resp 4

Question 1

what controls Bronchoconstriction/dilation?

Answer 1

Paracrine control, CO2 being the major one, high levels causes dialation, low levels causes constriction
-histamine released from mast cells
-parasympathetic nerves innervate bronchiole smooth muscle and activate PLC-IP3(constrictions)
-Circulating epinephrine binding B2 adrenergic receptors(dialation)

Question 2

in a healthy person, where is 90% of arway resistance and why?

Answer 2

trachea and bronchi because they have the smalledst additive cross sectional area

Question 3

what is the equation for Alveolar ventilation?

Answer 3

ventilation rate x (tidal volume - deadspace) = alveolar ventilation

Question 4

what is the equation for pulmonary ventilation?

Answer 4

ToT pulmonary ventilation = ventilation rate x tidal volume