Chemical Coordination and integration — BIOLOGY STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYChemical Coordination and integration3 Marks
Question
Explain how hypothalamus functions as an endocrine gland?
✓
Answer
The neurosecretory cells, called nuclei, of hypothalamus secrete hormones, which regulate the synthesis and secretion of pituitary hormones.
The hormones produced are of two types:
Releasing hormones, which stimulate the secretion of pituitary hormones, e.g. gonadotropin-releasing hormone (GnRH) stimulates the anterior pituitary to secrete gonadotropins namely follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
Inhibiting hormones, which inhibit the synthesis of hormones by the pituitary, e.g. somatostatin inhibits the secretion of growth hormone by the anterior pituitary.
These hormones are transported to the anterior pituitary through a portal circulatory system.
The posterior pituitary is under the direct neural regulation of the hypothalamus; the hormones oxytocin and vasopressin synthesised by hypothalamus are transported axonally to the posterior pituitary and remain stored in the axon terminals there.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.