Physiology Thyroid e0cd05b8 Percentage of T4 and T3 released from thyroid gland- A 50% T4; 50% T3 B 25% T4; 75% T3 C 80% T4; 20% T3 D 1000% T4; 0% T3 High-Yield Explanation Ans. is 'c' i.e., 80% T4; 20% T3 " Approximately 80% of secreted hormone is T4 and 20% is T3".