Final answer:
The myometrium is not primarily composed of connective tissue; it is composed of smooth muscle tissue, which makes it the correct answer to the student's question.
Step-by-step explanation:
The student asks which among the listed options is NOT primarily composed of connective tissue. The options are blood, bone, tendon, intervertebral disc, and myometrium. Blood, bone, tendon, and intervertebral disc are all connective tissues.
Blood is a fluid tissue with a liquid matrix and no supporting fibers, bone is a supportive tissue highly vascularized and rich in rigid mineralized matrix, tendons are part of dense regular connective tissue which align fibers in parallel, and intervertebral discs are formed from fibrocartilage which is also a type of connective tissue. The myometrium, however, is primarily composed of muscle tissue, specifically smooth muscle, and is therefore not composed primarily of connective tissue. According to the text, muscle is distinct from connective tissue. Hence, the correct answer is e. Myometrium.