(a) A - Carbon dioxide ;
B - Oxygen ;
(b) Oxygen - Needed for tissue respiration to provide energy;
(c) K - plasma
P - Walls of alveolus
(d) - Moist to dissolve gases which diffuse in solution form ;
- Thin alveolus wall for gases to diffuse across a short distance;
- Supplied with dense network of capillaries for the transportation of gases to end from exchange surface ;
- Have large surface area to volume ratio to increase the rate of gaseous exchange ;
sharon kalunda answered the question on May 29, 2019 at 07:39
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