System Function: Endocrine - Massage and Bodywork Licensing Examination Mblex

1. What is the primary function of the thyroid gland hormones $T_3$ and $T_4$?

   Increase metabolic rate and support growth and development. These iodinated hormones enhance basal metabolic rate and are crucial for normal physical and mental development.

2. Which anterior pituitary hormone stimulates the adrenal cortex to secrete cortisol?

   Adrenocorticotropic hormone (ACTH). It triggers the adrenal cortex to produce glucocorticoids, aiding in stress adaptation and metabolism.

3. Which two anterior pituitary hormones regulate ovarian and testicular function?

   Follicle-stimulating hormone (FSH) and luteinizing hormone (LH). They coordinate gametogenesis and sex hormone production in gonads for reproductive function.

4. Which anterior pituitary hormone stimulates thyroid hormone production?

   Thyroid-stimulating hormone (TSH). It binds to thyroid receptors, prompting synthesis and release of thyroxine for metabolic regulation.

5. Which posterior pituitary hormone increases water reabsorption by the kidneys?

   Antidiuretic hormone (ADH, vasopressin). It promotes aquaporin insertion in renal collecting ducts, reducing urine output to conserve body water.

6. Which thyroid hormone lowers blood calcium by inhibiting osteoclast activity?

   Calcitonin. Produced by thyroid C cells, it promotes calcium deposition in bones when blood levels are high.

7. What is the primary role of the hypothalamus in endocrine control?

   Regulates pituitary hormone release via releasing and inhibiting hormones. It integrates nervous and endocrine systems by producing factors that control anterior pituitary secretion.

8. Which gland is known as the master gland because it controls other endocrine glands?

   Pituitary gland. It secretes hormones that stimulate or inhibit other endocrine glands, orchestrating overall hormonal regulation.

9. What is a hormone, in endocrine system terms?

   A chemical messenger released into blood to act on target cells. Hormones travel via bloodstream to distant organs, binding to specific receptors to elicit cellular responses.

10. Which part of the pituitary produces and secretes its own hormones?

    Anterior pituitary (adenohypophysis). Derived from glandular tissue, it synthesizes hormones like TSH and GH in response to hypothalamic signals.

11. Which part of the pituitary stores and releases hypothalamic hormones?

    Posterior pituitary (neurohypophysis). Composed of neural tissue, it acts as a storage site for ADH and oxytocin produced in the hypothalamus.

12. Which adrenal cortex hormone increases sodium retention and potassium excretion?

    Aldosterone. A mineralocorticoid, it acts on renal tubules to maintain electrolyte balance and blood pressure.

13. Which gland secretes melatonin to help regulate circadian (sleep-wake) rhythms?

    Pineal gland. Located in the brain, it responds to light cues via the retina to modulate sleep patterns through melatonin.

14. Which anterior pituitary hormone stimulates milk production in the mammary glands?

    Prolactin (PRL). It acts on mammary alveolar cells to initiate and maintain lactation post-pregnancy.

15. Which adrenal cortex hormone is a glucocorticoid important for stress response?

    Cortisol. As the primary glucocorticoid, it modulates inflammation, metabolism, and immune function during stress.

16. Which anterior pituitary hormone primarily promotes body growth and tissue repair?

    Growth hormone (GH, somatotropin). It stimulates protein synthesis and cell division in bones and muscles, essential for development.

17. What is the primary function of the endocrine system in the body?

    Secretes hormones to regulate long-term body functions and homeostasis. It maintains physiological balance through hormone secretion affecting metabolism, growth, and reproduction over extended periods.

18. Which gonads produce testosterone and which produce estrogen and progesterone?

    Testes produce testosterone; ovaries produce estrogen and progesterone. Gonadal hormones support secondary sex characteristics, gamete production, and reproductive cycles in males and females respectively.

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