Biology Questions and Answers
The gas exchange units of the
mammalian lungs are the alveoli.
- What is the physical
process through which gas
exchange is accomplished in
the pulmonary alveoli?
The gas exchange (entry of oxygen and
exit of carbon dioxide) in the pulmonaryalveoli occurs by simple diffusion in
favor of the partial pressure gradient.
When the oxygen partial prinhaled air is higher than the oxygenessure in the
partial pressure of the capillariesalveoli the air diffuses to the circulatory of the (^)
system. If the oxygen partial pressure
in the air is lower (a rare situation sincethe blood that reaches the alveoli is
venous blood) the oxygen exits the
circulatory system.carbon dioxide. The same is true for
- What is the structure of
the central nervous system
that regulates pulmonary
respiration?
The pulmonary rby the neural respiratory ceespiration is conter locatentrolledd (^)
within the medulla (the lower part of the
brain continuous to the spinal cord).
- What is the chemical
equation of the formation of
bicarbonate from carbon
dioxide and water? What is
the enzyme that catalyzes this
reaction?
The chemical equation of the chemical
equilibrium obicarbonate having as reagents carbonf the formation of (^)
dioxide and water is as follows:
CO 2 + H 2 0 --> H 2 CO 3 --> H+ + HCO 3 -
The reaction is catalyzed carbonic anhydrase present in by the enzymered blood (^)
cells.
- What are the
consequences of shifting the
chemical equilibrium of the
formation of bicarbonate from
carbon dioxide and water
towards the increase of
product (bicarbonate)
formation?
The increase in product formation in the
chemical equilibrium obicarbonate from carbon dioxide andf the formation o f
water heightens the concentration of
hydrogen ions and thus lowthe solution. ers the pH of
http://www.biology-questions-and-answers.com