Question

Select the incorrect option.

• A. Testosterone - steroid hormone
• B. Calcium- second messenger
• C. Insulin- water soluble hormone
• D. PTH and thyroxine - antagonistic hormones

Answer 1

The correct option is D PTH and thyroxine - antagonistic hormones

PTH (Parathyroid hormone) and calcitonin are antagonistic hormones. These two hormone play a role in maintaining blood calcium levels:

• Parathyroid hormone increases the calcium levels in the blood.
• Calcitonin lowers the blood calcium levels.

Steroid hormones include estrogen progesterone, testosterone, cortisol etc.

Second messengers include cyclic AMP, $I{P}_3$ , calcium etc.

Insulin is a protein hormone. Protein hormones are water soluble hormones.