The bronchi (singular: bronchus) are the airways that lead from the trachea into the lungs, and then branch into smaller bronchioles. Structurally, the bronchi are made up of cartilage that gives them stability and prevents their collapse.
Answer:
The main difference between microtubules and microfilaments is that microtubules are long, hollow cylinders, made up of tubulin protein units whereas microfilaments are double-stranded helical polymers, made up of actin proteins.
Is when you breathe in oxygen and exhale carbon dioxide
