Question

1. what are the main parts of the nervous system?

heart, lungs, and blood vessels
muscles, bones, and tendons
brain, spinal cord, and nerves
stomach, intestines, and liver

Explanation:

The nervous system's main components are the brain, spinal cord, and nerves. The heart, lungs, blood vessels belong to the circulatory system; muscles, bones, tendons to the musculoskeletal system; stomach, intestines, liver to the digestive system. So the correct option is the one with brain, spinal cord, and nerves.

Answer:

C. Brain, spinal cord, and nerves (assuming the options are labeled A - D with the last option being D, and the correct one is the third option which would be C if labeled sequentially)