Which of the following is not an example of muscular tissue: The right ventricle of the heart, the Achilles tendon, the tissue lining the inside of the small intestine, or the pectoralis major?
Both the Achilles tendon and the lining of the small intestine is not muscular tissue.
A bit of a tricky question when you are only allowed to give one answer. The ventricle of the heart and the pectoralis major (chest muscle) are definitely musclar tissue. For the other two it is more complicated.
When I read 'the lining of the small intestine', I think of epithelial cells. Epethelium is not muscular tissue. However, the walls of the small intestine do contain smooth muscle cells to move food forward.
Tendons are difficult to classify, they belong to the musculoskeletal system. Tendons connect muscles to bone but are neither muscle nor bone. Tendons are continuous with muscles, but consist of fibrous connective tissue, not muscular tissue.