The brain signals the body of an animal to move by transmitting electrical impulses through neurons. An animal is then able to walk or run because

the heart of the circulatory system works with the stomach of the digestive system.
the muscles of the muscular system work with the bones of the skeletal system.
the glands of the endocrine system work with the skin of the integumentary system.
the kidneys of the excretory system work with the white blood cells of the immune system.

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The correct answer is: the muscles of the muscular system work with the bones of the skeletal system.

To understand how the brain signals the body to move, let's start with the nervous system. The brain is the command center of the nervous system, which is responsible for sending and receiving signals throughout the body. These signals are transmitted as electrical impulses through specialized cells called neurons.

When the brain wants the body to move, it sends electrical signals down the spinal cord and out to the muscles via motor neurons. The muscles, which are part of the muscular system, contract or relax in response to these signals. This contraction and relaxation of muscles allow the body to perform various types of movements such as walking or running.

However, for efficient movement, the muscles need to attach to a framework that provides support and structure. This is where the skeletal system comes into play. The bones of the skeletal system act as levers, providing attachment points for muscles and allowing them to exert force and create movement.

When the muscles contract and pull on the bones, it causes the bones to move, resulting in the desired movement of the body. The bones also protect vital organs and provide a framework for the body to maintain its shape.

It's important to note that while the other systems mentioned (circulatory, digestive, integumentary, and excretory) are essential for overall body function and health, they do not directly play a role in the brain's signaling to the muscles for movement.

Think of it. What allows the body to move?