RESPIRATION aka GAS EXCHANGE
A. Define the terms “external respiration” and “internal respiration”.
B. Which transport mechanism is responsible for the movement of oxygen and carbon dioxide during these processes?
C. In this passive transport mechanism, gases always move from an area of _______ concentration to an area of ______concentration until equal concentrations are reached.
Answers
A) External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air. Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells
B)At the respiratory membrane, where the alveolar and capillary walls meet, gases move across the membranes, with oxygen entering the bloodstream and carbon dioxide exiting. It is through this mechanism that blood is oxygenated and carbon dioxide, the waste product of cellular respiration, is removed from the body.
C) In this passive transport mechanism, gases always move from an area of higher concentration to an area of lower concentration until equal concentrations are reached.