Which of the following statements about sex determination in humans is correct? MCQ with Answer and Explanation

Explanation:
Cholecystokinin (CCK) is a peptide hormone released by the I cells of the duodenum when acidic chyme containing fats (lipids) and partially digested proteins enters from the stomach. CCK has two major digestive actions: 1) It stimulates the gall bladder to contract, releasing stored bile into the duodenum to emulsify fats. 2) It stimulates the pancreatic acinar cells to secrete a juice rich in digestive enzymes (lipases, proteases, amylase). It also slows down gastric emptying, allowing more time for digestion in the small intestine.

Explanation:
Capitulum (head) is characteristic of the Asteraceae family, where numerous small florets are arranged on a flattened disc. Raceme has flowers on pedicels along an elongated axis, spike sessile, umbel umbrella-like. Sunflower inflorescence is a capitulum.

Explanation:
The right atrium receives deoxygenated blood from the systemic circulation via the superior and inferior vena cavae. It pumps blood to the right ventricle. The left atrium receives oxygenated blood from the lungs, the left ventricle pumps to the body, the right ventricle to the lungs.