Picking up a heavy bag of groceries would primarily utilize the muscular system of the human body. The muscular system is responsible for movement and generating force, allowing us to perform physical activities such as lifting, carrying, and pulling.
When picking up a heavy bag of groceries, several muscles in the body work together to generate the force required to lift the weight. The primary muscles involved in this activity are the biceps and triceps muscles of the arms, the muscles of the back, and the leg muscles that help stabilize the body.
Additionally, the core muscles, which include the abdominals and lower back muscles, also play a crucial role in lifting heavy objects, as they help stabilize the spine and prevent injury.
Overall, picking up a heavy bag of groceries requires a coordinated effort from several muscles in the body, primarily those of the arms, back, and legs, as well as the core muscles.