Lab 6 - lung lab

Question 1

Surface area of human lungs vs human body surface area:

Answer 1

50-100 m2; 2 m2

Question 2

Structure of human lungs:

Answer 2

Series of branching tubes that end in alveoli, small membraneous air sacs.

Question 3

Factors that influence gas exchange between lungs and blood:

Answer 3

Surface area, diffusion distance, and concentration gradient.

Question 4

Let's talk acronyms: 
TV
IRV/ERV
RV
VC
TLC

Answer 4

TV: tidal volume. volume of a normal breath.
IRV/ERV: inspiratory/expiratory reserve volume. how much you can in/exhale after TV.
RV: residual volume. the air you can’t breathe out no matter what.
VC: vital capacity. the total amount of air that can be inspired and expired.
TLC: total lung capacity. the total volume that the lungs can hold.

Question 5

TV and breathing rate are regulated by the __ in the __.

Answer 5

Respiratory centre, medulla oblongata.

Question 6

Receptors that can affect TV and breathing rate:

Answer 6

Peripheral chemoreceptors (for O2, CO2, and pH) and stretch receptors in the lungs.

Question 7

Experiment 1: exercise and breathe

Answer 7

Measure TV, IRV, ERV with spirometer. Exercise. Do step 1 again.

Question 8

Units:

Answer 8

Convert mV to L.

Question 9

Breathing rate (breaths/min) calculation:

Answer 9

(60 seconds/minute) / mean breath period (sec/breath)

Question 10

Minute respiratory volume (L/min) calculation:

Answer 10

Breathing rate * TV

Question 11

TLC calculation: (from VC)

Answer 11

VC = 0.75 TLC

Question 12

Phys sig of experiment 1:

Answer 12

TV should go up, IRV and ERV should go down, VC should stay the same.