Which of the following is responsible for the 'lub-dub' sound of the heart? MCQ with Answer and Explanation

Explanation:
Ovulation is the rupture of the mature Graafian follicle and release of a secondary oocyte from the ovary, typically around day 14 of a 28-day menstrual cycle, triggered by LH surge. Menstruation is the shedding of uterine lining. Fertilization is fusion of sperm and ovum, implantation is embedding of blastocyst in the endometrium.

Explanation:
Albinism is a genetic disorder due to a defect in tyrosinase enzyme, leading to little or no melanin production, affecting skin, hair, and eye color. Vitiligo is patchy loss of melanocytes, jaundice is yellowing from bilirubin, erythema is redness. Albinism results in extreme sensitivity to sunlight.

Explanation:
The brain is the central and most complex organ of the nervous system, processing sensory information, controlling motor functions, and regulating higher cognitive processes. The heart is a muscular organ that acts as the central pump of the circulatory system, propelling blood through the network of blood vessels to deliver oxygen and nutrients. The lungs are a pair of spongy, air-filled organs that are the primary components of the respiratory system, facilitating the vital exchange of oxygen and carbon dioxide. All statements are correct.