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Which gland in the neck makes hormones that regulate metabolism?
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The thyroid gland
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Which small gland at the base of the brain helps regulate other endocrine glands?
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The pituitary gland
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Which glands sit above the kidneys and make hormones including cortisol and adrenaline?
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The adrenal glands
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Which organ filters blood, supports immune responses, and recycles old red blood cells?
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The spleen
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Which organ helps T cells mature, especially during childhood?
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The thymus
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Which tissue inside many bones produces blood cells?
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Bone marrow
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Which structures filter lymph and help immune cells encounter pathogens?
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Lymph nodes
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