OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Prepare for the OCR GCSE Biology Exam with detailed quizzes, flashcards, and explanations. Enhance your understanding of biology concepts and get exam-ready today!

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What is the main function of progesterone in the female body?

To stimulate egg production
To support pregnancy
To regulate body temperature
To enhance sexual desire

The correct answer is: To support pregnancy

The primary role of progesterone in the female body is to support pregnancy. This hormone is produced mainly in the ovaries after ovulation, specifically by the corpus luteum. Its main function during pregnancy is to prepare the uterine lining (endometrium) for the implantation of a fertilized egg. Progesterone thickens the endometrium, making it suitable for an embryo to attach and grow. It also helps maintain the endometrium throughout pregnancy, preventing it from shedding as it would in a typical menstrual cycle. Additionally, progesterone plays a crucial role in suppressing uterine contractions, ensuring a stable environment for the developing fetus. Furthermore, if pregnancy occurs, progesterone levels remain elevated, supporting the continued development of the placenta. Therefore, the hormone is vital in creating and maintaining the conditions necessary for a successful pregnancy. The other options, while interesting aspects of female biology, do not align with the primary function of progesterone as directly related to pregnancy support. For instance, stimulating egg production is primarily governed by follicle-stimulating hormone (FSH), whereas sexual desire is influenced by other hormones like estrogen and testosterone, and body temperature regulation is more associated with metabolic processes.