The body system described in the image is the nervous system, which is primarily responsible for coordinating body functions using electrical messages.

Explanation:

The nervous system is connected by nerves to each and every structure and organ, in order to control their functions. This occurs because of the connection between the central (CNS) and peripheral nervous systems.

The neuron is the functional base of the nervous system, and is responsible for the transmission of information in the form of electrical signals, called nerve impulses.

The transmission of nerve impulses occurs through the joint action of receptors, nerves, integration centers and effectors.The information that goes from the periphery to the CNS goes by afferent pathway, while from the CNS to the periphery it travels by efferent pathway.

The other options are not correct because:

Protecting and defending the body against germs that have entered the body is function of Immune system
Regulating body functions using chemicals called hormones is function of endocrine system.
Transporting oxygen, carbon dioxide, nutrients, wastes, hormones, and other materials is a function related to circulatory system.

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3 years ago