Which of the following is the correct direction of movement of gasses between the systemic tissues and the systemic capillaries?
a. CO₂ and O₂ both diffuse from the capillaries to the systemic tissue
b. CO₂ diffuses from the systemic tissue to the capillaries
c. O₂ diffuses from the systemic tissue to the capillaries
d. CO₂ diffuses from the capillaries to the systemic tissue