The part of the human digestive system where most chemical digestion and absorption occurs is the: MCQ with Answer and Explanation

Explanation:
The endocrine part of the pancreas—the islets of Langerhans—contains β-cells that secrete insulin (lowers blood glucose), α-cells secrete glucagon (raises blood glucose), and δ-cells secrete somatostatin. Exocrine pancreas secretes digestive enzymes (trypsin, lipase, amylase). Pepsin is from stomach, bile from liver, gastrin from stomach. Insulin deficiency causes diabetes mellitus.

Explanation:
Insulin-like Growth Factor 1 (IGF-1), also known as somatomedin C, is a peptide hormone structurally similar to insulin. It is primarily synthesized and secreted by the liver (and to a lesser extent by other tissues) in response to stimulation by Growth Hormone (GH). IGF-1 mediates most of the growth-promoting (anabolic) effects of GH. It stimulates the proliferation and differentiation of chondrocytes (cartilage cells) in the epiphyseal plates of bones, promotes protein synthesis in muscles, and supports the growth of various other tissues.

Explanation:
Arthropoda is the largest phylum of the animal kingdom, and its defining characteristic is the presence of jointed appendages (legs, antennae, etc.). The word 'Arthropoda' literally means 'jointed legs'. They also have a chitinous exoskeleton and a hemocoel (blood-filled body cavity). Examples include insects, spiders, and crustaceans.