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Endocrine System & Hormone Balance Flashcards

7 cards from real NTA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which compounds from cruciferous vegetables support healthy estrogen metabolism in the liver?

    Answer: Indole-3-carbinol and DIM

    I3C/DIM promote favorable 2-hydroxylation estrogen pathways.

  2. Which mineral is most closely linked to testosterone production and is rich in oysters?

    Answer: Zinc

    Zinc is a cofactor in testosterone synthesis and sperm health.

  3. Which foods are notable sources of phytoestrogens?

    Answer: Flaxseeds and soy

    Lignans in flax and isoflavones in soy weakly bind estrogen receptors.

  4. After ovulation, which structure produces most of the progesterone in the menstrual cycle?

    Answer: Corpus luteum

    The corpus luteum forms from the ruptured follicle and secretes progesterone.

  5. Melatonin is synthesized by the pineal gland from which neurotransmitter?

    Answer: Serotonin

    Serotonin is converted to melatonin in darkness, regulating sleep.

  6. Vitamin D functions in the body most like which of the following?

    Answer: A steroid-like hormone

    Vitamin D is a secosteroid that binds nuclear receptors to regulate genes.

  7. Polycystic ovary syndrome (PCOS) is most commonly associated with which metabolic issue?

    Answer: Insulin resistance with elevated androgens

    Hyperinsulinemia stimulates ovarian androgen production in many with PCOS.

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Sources & references

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  1. nutritionaltherapy.com — Renewal, test delivery, eligibility, registration, test dates · verified Oct 2026
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