Thyroid Gland: Essential for Life — Hormones, Functions, and Survival
Why the Thyroid Is Indispensable
Thyroid hormones (T4, T3) regulate basal metabolic rate of virtually every cell. Without them, life is unsustainable.
Key Functions
| System | Thyroid Hormone Actions |
|---|---|
| Cardiovascular | ↑ Heart rate, contractility, β-adrenergic sensitivity; ↓ systemic vascular resistance |
| Metabolic | ↑ Lipolysis, gluconeogenesis, cholesterol clearance; ↑ BMR 10–15% |
| Neurologic | Myelination, synaptogenesis (fetal/neonatal); mood, cognition (adult) |
| GI | ↑ Motility, secretion |
| Reproductive | Menstrual regularity, fertility, placental development |
| Skeletal | Bone turnover; excess → osteoporosis |
| Thermogenic | ↑ Na⁺/K⁺-ATPase, mitochondrial uncoupling → heat |
Hypothyroidism Without Treatment
Myxedema coma: hypothermia, bradycardia, hypotension, hyponatremia, obtundation → death.
Living Without a Thyroid
Possible only with lifelong levothyroxine replacement (1.6 µg/kg/day). Monitoring TSH every 6–12 months. Quality of life normal with adequate replacement.
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