What organ contains lymphocytes phagocytes plasma cells monocytes and reticular fibers

Medullary sinuses contain histiocytes (immobile macrophages) and reticular cells. A lymph node contains lymphoid tissue, i.e., a meshwork or fibers called reticulum with white blood cells enmeshed in it. The regions where there are few cells within the meshwork are known as lymph sinus.

Explanation:

Every two weeks increase your distance by 2 miles. Focus on strength training 3 times a week and increase intensity at each work-out until you are at a plateau. Continue there building endurance. Keep a record of your heart rate so you don't overdo it.