The disease caused by the poliovirus primarily affects the: MCQ with Answer and Explanation

Explanation:
Color blindness (specifically red-green color blindness) is an X-linked recessive disorder. The gene responsible is located on the X chromosome. Males (XY) are more frequently affected because they only have one X chromosome; a single recessive allele will cause the disorder. Females (XX) need two recessive alleles to be affected, making them more likely to be carriers.

Explanation:
Pancreatic Polypeptide (PP) is a hormone secreted by the F cells (also known as gamma cells), which are scattered throughout the islets of Langerhans in the pancreas, primarily in the head of the pancreas. Its secretion is stimulated by the ingestion of a meal, particularly one rich in protein. Its primary functions are inhibitory: it inhibits the secretion of pancreatic digestive enzymes, inhibits gall bladder contraction, and slows down gastric emptying. It is thought to regulate the rate of nutrient absorption and prevent over-digestion.

Explanation:
The sinoatrial node spontaneously depolarizes, setting the rhythm of the heart. The reason correctly explains its role as pacemaker.