Mechanism of hormone actionहॉर्मोन क्रिया की क्रियाविधि
NCERT Fig 19.5 · interactive diagram
📖 Read Ch 19 with this diagramइस डायग्राम के साथ अध्याय 19 पढ़ेंIs diagram ke saath Ch 19 padhiyeAll diagramsसभी डायग्रामSaare diagrams
Parts and their functions
- Target cell (लक्ष्य कोशिका) — Has specific receptors for the hormone.
- Protein hormone (प्रोटीन हॉर्मोन) — E.g., insulin, glucagon, FSH; stays outside the cell.
- Membrane receptor (झिल्ली ग्राही) — Binds the hormone on the cell surface.
- Second messenger (द्वितीयक संदेशवाहक) — cAMP, IP₃, Ca²⁺ — regulate cellular metabolism.
- Physiological responses (शारीरिक अनुक्रियाएँ) — E.g., tissue growth, differentiation.
- Steroid hormone (स्टेरॉयड हॉर्मोन) — E.g., cortisol, testosterone, estradiol, progesterone; lipid-soluble, enters the cell.
- Intracellular receptor (अंतःकोशिकीय ग्राही) — Mostly nuclear; forms the hormone–receptor complex.
- Nucleus (केंद्रक) — Site of intracellular (nuclear) receptors.
- Gene expression (जीन अभिव्यक्ति) — Complex interacts with the genome → mRNA.
- Proteins → responses (प्रोटीन → अनुक्रियाएँ) — New proteins bring physiological and developmental effects.
Original diagram drawn by Simple Learning Hub, based on NCERT Fig 19.5. Report a mistake