The respiratory cycle

Question 1

what is V dot

Answer 1

airflow or volume per unit time

Question 2

muscles of inspirtation

Answer 2

scalene: raise 1st and 2nd ribs
Sternomatoids: raise sternum
some muscles in head and neck

Question 3

at rest what is the intrapleural pressure

Answer 3

-5 cm H2O

Question 4

max negative intrapleural pressure? when does it occur?

Answer 4

-8 cm H20 and during inspiration

Question 5

alveolar pressure at rest, during inspiration, during expiration

Answer 5

rest = O
inspiration = -1 
expiration = +1

Question 6

when does intrapleural pressure reach its lowest point?

Answer 6

at the end of inspiration

Question 7

alveolar pressure value

Answer 7

0 at rest
-1 midway through inspiration
0 at end of inspiration
airflow stops when inspiration is at 0
midway through expiration = +1 (air flows out)
end of expiration is back at 0 = no air flow

Question 8

minute ventilation

Answer 8

how much air is inhaled every minute

V(dot) = Vt x frequency

Question 9

estimating anatomic dead space

Answer 9

by using patients weight

Question 10

minute alveolar ventilation calculation

Answer 10

subtract anatomic dead space volume from the tidal volume then multiple by respiratory rate