Correct option is A
The correct answer is (A) Uterus
Explanation:
• The uterus (womb) is a major female hormone-responsive secondary sex organ of the reproductive system.
• Every month, anticipating a potential pregnancy, the inner lining of the uterus (the endometrium) thickens and becomes richly supplied with blood vessels.
• This preparation ensures that if an egg is fertilized by a sperm in the fallopian tube, the resulting embryo has a nourishing environment to implant and grow.
• If fertilization does not occur, this enriched endometrial lining sheds, exiting the body as menstrual blood, marking the beginning of the menstrual cycle.
Information Booster:
• Hormonal Control: The thickening of the uterine lining is primarily driven by the hormones estrogen and progesterone, which are secreted by the ovaries.
• Implantation: The physical embedding of the fertilized egg (blastocyst) into the uterine wall is called implantation, which officially marks the start of a pregnancy.
Additional Knowledge:
• Option B (Pharynx): A part of the throat behind the mouth and nasal cavity, involved in the digestive and respiratory systems (swallowing and breathing).
• Option C (Pancreas): A glandular organ in the digestive system and endocrine system, responsible for producing insulin, glucagon, and digestive enzymes.
• Option D (Kidney): A vital organ of the excretory system that filters waste products from the blood to produce urine.