The anterior pituitary develops from which of the following germ layers during embryonic development?

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: C

Rationale: Hormones travel via the bloodstream (e.g., thyroxine to cells), ensuring distant delivery in endocrine signaling. Lymphatic system aids immunity/fluid, not primary hormone transport secondary at best. Nerve axons carry neurotransmitters, not hormones neural domain. Cell membranes host receptors, not travel routes. Bloodstream's circulatory path distinguishes it, key to endocrine distribution, unlike lymphatic, neural, or static options.

Correct Answer: C

Rationale: Pituitary gland, in the brain's sella turcica, secretes hormones (e.g., GH, TSH) master gland. Adrenals sit atop kidneys, not brain. Pancreas is abdominal, glucose-focused. Parathyroids are neck-based, calcium regulators. Pituitary's intracranial location distinguishes it, critical for endocrine control, unlike external glands.

Correct Answer: C

Rationale: Oxytocin release (e.g., labor) uses positive feedback uterine contractions increase oxytocin, amplifying delivery. Negative feedback stabilizes (e.g., cortisol). 'Neutral' isn't a mechanism undefined. 'Hormonal' isn't feedback type control mode. Positive feedback distinguishes oxytocin's escalating role, critical for childbirth, unlike stabilizing or vague options.

Correct Answer: D

Rationale: Thyroid gland uses iodine to synthesize T3/T4 from thyroglobulin metabolic hormones. Adrenal cortex (cortisol) uses cholesterol, no iodine. Pancreas (insulin) needs amino acids. Parathyroids (PTH) regulate calcium, no iodine. Iodine's thyroid necessity distinguishes it, critical for hormone synthesis, unlike steroid, peptide, or calcium glands.