Peripheral chemoreceptors that regulate breathing are located in the:

A. A small amount of carbon dioxide is transported dissolved in plasma, but this accounts for only about 5–10% of the total CO₂ in the blood.
B. Some carbon dioxide binds to hemoglobin to form carbaminohemoglobin, but this form carries only about 20–30% of CO₂.
C. Albumin primarily transports hormones, fatty acids, and other substances—not carbon dioxide.
D. The majority of carbon dioxide (about 60–70%) is carried in the blood as bicarbonate ions (HCO₃⁻). This occurs through a reaction where CO₂ combines with water to form carbonic acid, which then dissociates into bicarbonate and hydrogen ions.

A. Elevated WBC count and increased serum potassium are not common side effects of bronchodilators. These might be seen in other conditions or medications, but not typically with bronchodilators.
B. Nervousness, palpitations, and tremors are common side effects of bronchodilators, particularly beta-agonist bronchodilators like albuterol. These symptoms occur because bronchodilators stimulate beta receptors in the body, leading to increased heart rate and stimulation of the nervous system.
C. Urinary retention and gynecomastia are more commonly associated with other medications, such as anticholinergics or certain hormonal treatments, not bronchodilators.
D. Steven Johnson Syndrome is a rare and severe skin reaction that can occur with certain medications, but it is not a common side effect of bronchodilators.