The mediastinum is the cartilage that forms the lower portion of the breast bone. a. true b. false

The answer is False. The mediastinum is not a cartilage that forms the lower portion of the breast bone, the mediastinum is the middle part of the chest cavity, which is located between the lungs of an individual. The Mediastinum is the area located between the lungs, it contains organs such as the heart and its large arteries and veins. It may also include the trachea, the esophagus, the bronchi and last but not the least the lymph nodes.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.