Lungs - What are the primary organs of the respiratory system?, Blood vessels - How does the circulatory system deliver oxygen to cells?, Skin - What is the largest organ in the human body?, Barrier - Can you explain how the integumentary system protects the body?, T cells - What role does the thymus gland play in the immune system?, Stimulate glands - How do hormones produced by the pituitary gland affect other glands in the body?, Oxygen, - What are the roles of red and white blood cells in the circulatory system?, Hormones - How does the endocrine system regulate metabolism?, Brainstem - Which part of the brain is responsible for regulating basic bodily functions like breathing and heart rate?, Impulses - How does the nervous system transmit signals between neurons?,

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