How does the nicotine from cigarette smoking disrupt oxygen distribution to the cells? it restricts air flow through the bronchi. it reduces the surface area of alveolar sacs. it binds to hemoglobin in red blood cells . it affects the nerve signals that regulate breathing.

Which of the following defines scoliosis? a. a posture disorder characterized by the shoulders being rounded and the back hunched b. a posture disorder in which the spine curves up the back like a snake c. a posture disorder characterized by excessive curvature or arch in the lower back d. none of the above