What is counted as day 1 of the cycle?

Prepare for the NAPLEX Contraception and Infertility Test. Engage with interactive flashcards and multiple choice questions, each equipped with hints and explanations. Ensure your readiness for the exam!

Multiple Choice

What is counted as day 1 of the cycle?

Explanation:
Day one is defined by the first day of menstrual bleeding. This bleeding marks the start of a new cycle because it signals the beginning of the follicular phase and the rebuilding of the endometrium after shedding. Ovulation occurs later in the cycle, typically around the middle, when an egg is released. The luteal phase follows ovulation and ends with the onset of the next menses. A fertilization event, even if it occurs, happens after ovulation, not at the start of the cycle. So the correct choice is the start of menses.

Day one is defined by the first day of menstrual bleeding. This bleeding marks the start of a new cycle because it signals the beginning of the follicular phase and the rebuilding of the endometrium after shedding. Ovulation occurs later in the cycle, typically around the middle, when an egg is released. The luteal phase follows ovulation and ends with the onset of the next menses. A fertilization event, even if it occurs, happens after ovulation, not at the start of the cycle. So the correct choice is the start of menses.

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