PSI Barbering Practice Exam

Which body system relies upon the skeletal and nervous systems for its activities?

1. Digestive

2. Endocrine

3. Muscular

4. Respiratory

The correct answer is: Muscular

The muscular system relies on the skeletal and nervous systems for its activities because the muscles work in conjunction with the bones to facilitate movement and bodily functions. The skeletal system provides the necessary structure and support, making it possible for muscles to pull against the bones to create movement. Meanwhile, the nervous system is crucial for signaling. It sends impulses to muscles, instructing them when and how to contract, which is vital for coordinated movement. The other body systems listed do not directly depend on both the skeletal and nervous systems in the same way. For example, the digestive system functions primarily through a series of organs responsible for breaking down food and does not rely on the skeletal system. The endocrine system involves glands that secrete hormones into the bloodstream and generally functions independently of the skeletal system, although it interacts with various bodily systems. The respiratory system is focused on the exchange of gases and involves organs such as the lungs and trachea, without a direct reliance on the skeletal structure or the nervous impulses for its fundamental operations. Thus, the muscular system stands out for its reliance on both the skeletal and nervous systems.