Gas exchange occurs in which of the following structures?

A. Type 1 diabetes is an autoimmune condition where the body's immune system attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the pancreas produces little to no insulin, which is essential for regulating blood glucose levels.
B. Type 1 diabetes is not reversible. It is a lifelong condition that requires ongoing management with insulin therapy. While diet, exercise, and weight management are important for overall health and can help manage blood glucose levels, they cannot reverse type 1 diabetes.
C. This description is characteristic of type 2 diabetes, not type 1. In type 2 diabetes, the body’s cells become resistant to the effects of insulin, and the pancreas may not produce enough insulin. In type 1 diabetes, the problem is the lack of insulin production due to autoimmune destruction of the pancreatic beta cells.
D. Insulin is not released into the gastrointestinal tract. Insulin is a hormone that is released into the bloodstream by the pancreas. Its primary role is to help regulate blood glucose levels by facilitating the uptake of glucose into the body's cells for energy.

B. Beta-blocking medications, such as propranolol and metoprolol, can worsen asthma symptoms in some individuals by constricting the airways. Patients with asthma should avoid or use caution with beta-blockers, especially non-selective ones, as they can trigger or exacerbate asthma attacks.
C. Exposure to secondhand smoke is a well-established trigger for asthma symptoms and can exacerbate respiratory inflammation and airway hyperresponsiveness. Patients with asthma should avoid exposure to secondhand smoke whenever possible to reduce the risk of asthma exacerbations.
D. Carpeting and drapes can harbor dust mites, pet dander, and other allergens that can trigger asthma symptoms in susceptible individuals. Patients with asthma may benefit from removing carpeting and minimizing soft furnishings in the bedroom to reduce exposure to allergens and improve air quality.
E. Pets, particularly those with fur or feathers, can be potent allergens for individuals with asthma. Patients with asthma should consider removing pets from the home or at least keeping them out of the bedroom to minimize exposure to pet dander.
A. Cardiovascular exercise can trigger asthma symptoms in some individuals but it is not typically recommended to eliminate exercise altogether. Instead, patients with asthma should be encouraged to engage in physical activities that are well-tolerated and to use appropriate preventive measures, such as pre-exercise bronchodilator therapy and warm-up exercises, to minimize symptoms.