gas exchange in humans

Question 1

what is ficks law

Answer 1

rod is proportional to sa x difference in conc /thickness of membrane.

Question 2

describe the process of inspiration in humans

Answer 2

thoracic cavity enlarged creating an increased volume and rib cage moves up and out as intercostal muscles contract.
-diaphragm contracts and moves down
-pressure decreases and air moves down a pressure gradient.

Question 3

what is the ventilation rate

Answer 3

amount of air breathed in and out in one min. =tidal volume x breathes/min

Question 4

what is the tidal volume

Answer 4

how much air is inhaled and exhaled in each breath.

Question 5

describe some adaptations of the alveoli in humans

Answer 5

arranged in grape like structures and have a lrg sa.
-1 cell thick of squamous epithelial cells.
-densely covered ion blood capillaries.
-inner walls lined with suffracant -lowers surface tension .
-alveoli moist to aid diffusion.
-contain stretch receptors which prevents alveoli overfilling with air.