Question

Which one of the following pairs matches correctly?

• A. Atrioventricular Node (AVN)- Pacemaker
• B. Corpus luteum- Yellow colour
• C. Factor X (Stuart Factor)- Thromboplastin
• D. Mitral valve- Tricuspid valve

Answer 1

The correct option is B Corpus luteum- Yellow colour

Pacemaker serves to produce rhythmic impulses for a heart beat. The sinoatrial node (SA) node, present in the upper posterior wall of the right atrium, serves as pacemaker as its rate of impulse generation is highest (0.85/second). Atrio Ventricular Node (AVN) is a nodal tissue that regulates the heart beat and is present in the base of right atrium adjacent to the interatrial septum. It produces impulse at the rate of 0.45/second which is lower than that of SA node and hence, it is not considered as the pacemaker.

Corpus luteum is formed from ovulated Graafian follicle during the luteal phase in ovary under influence of LH. Since the first studied corpus luteum, Cow’s corpus luteum, is a yellow colored structure, hence the name “yellow body”. Human’s corpus luteum is cream coloured.

Factor X (Stuart Factor) is blood clotting factor while thromboplastin is factor III.

The atrioventricular valve (AV valve) present between the right atrium and right ventricle has three cusps/flaps and hence is called tricuspid valve. The AV valve present between left atrium and left ventricle is called as a mitral/bicuspid valve as it has two cusps/flaps.

Therefore, the correct answer is option B.