Multiple choice Which one pair out of the following represents one and the same thing? Atrio-ventricular- Pacemaker node (AVN) Corpus luteum-Yellow body Factor III-Stuant thromboplartin factor Mitral valve-Tricuspid valve Reveal answer Fill a bubble to check yourself B Correct answer Explanation Corpus luteum,is a yellow hormone-secreting body in the female reproductive system. It is formed in an ovary at the site of a follicle, or sac, that has matured and released its ovum, or egg, in the process known as ovulation.