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The menstrual cycle is the scientific term for the physiological changes that can occur in fertile women for the purposes of sexual reproduction and fertilization. The secretory phase in the human menstrual cycle is also called luteal phase and lasts for about 13 days. During secretory phase, the endometrium prepares for the implantation of an embryo and the corpus luteum is active and secretes progesterone hormone.

1. (a) The secretory phase in the human menstrual cycle is also called luteal phase.
2. (b) The luteal phase lasts for about 13 days.
3. (c) During secretory phase, the endometrium prepares for the implantation of an embryo.
4. (d) The corpus luteum is active and secretes progesterone hormone.

Correct answer: (a) The secretory phase in the human menstrual cycle is also called luteal phase.

Solution

The passage explicitly says the secretory phase is also called the luteal phase. The other options are true details from the passage, but the question asks for the specific statement identified as the correct answer.

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