How many of the given statements are true?

I. Pars nervosa stores and releases two hormones called oxytocin and vasopressin.
II. Melatonin influences the menstrual cycle.
III. Calcitonin stimulates reabsorption of Ca²⁺by the renal tubules.
IV. After ovulation, the ruptured follicle is converted to macula lutea.

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Statements III and IV are incorrect.

III. Thyrocalcitonin (TCT) decreases the blood calcium levels and inhibits reabsorption of $C a^{2 +}$ by the renal tubules.

IV. LH surge (peak concentration of LH) during the mid-cycle results in rupture of Graafian follicle and release of an ovum (ovulation). Remnants of Graafian follicle are transformed into the corpus luteum which secretes large amounts of progesterone to maintain the endometrium.

Zoology - Chemical Coordination and Integration Question with Solution | TestHub

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