PLTW Biomedical Science Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The muscular system plays a crucial role in the movement of the body and the transportation of substances within it, making this option the most accurate choice. Muscles work in conjunction with the skeletal system to facilitate movement, enabling actions such as walking, running, and lifting. Beyond just locomotion, muscles are also essential for processes like digestion and circulation, as they help move food through the digestive tract and blood through vessels.

While the muscular system contributes to protecting vital organs through posture and movement, this is not its primary function. The generation of electrical impulses is primarily the role of the nervous system, particularly neurons and specialized cells. The storage of minerals is mainly a function of the skeletal system, where bones act as reservoirs for essential minerals like calcium and phosphorus. Therefore, the primary function of the muscular system is aptly identified as facilitating movement and helping transport various substances throughout the body.