The cardiovascular (or circulatory) system transports blood, oxygen, and nutrients throughout the body.

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The endocrine system produces hormones that regulate metabolism, growth and development, tissue function, sexual reproduction, sleep, and mood.

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The integumentary system protects the body from outside damage.

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The lymphatic system connects the lymph nodes in our bodies and helps the circulatory and immune systems.

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The nervous system transmits signals through the body and controls voluntary and involuntary actions.

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