Chapter 2.1, Problem 27E

Blood Flow through the Brain One method of determining the level of blood flow through the brain requires the person to inhale air containing a fixed concentration of ${\text{N}}_{\text{2}}\text{0}$

nitrous oxide. During the first minute, the concentration of ${\text{N}}_{\text{2}}\text{0}$ in the jugular vein grows at an increasing rate to a level of $25\%$. Thereafter, it grows at a decreasing rate and reaches a concentration of about $4\%$

after $10$ minutes. Draw a possible graph of the concentration of ${\text{N}}_{\text{2}}\text{0}$ in the vein as a function of time.