Which chamber of the heart pumps oxygenated blood to the entire body? MCQ with Answer and Explanation

Explanation:
Vitamin C is a cofactor for enzymes that hydroxylate proline and lysine in procollagen, essential for proper collagen triple helix formation. Deficiency results in weak collagen and scurvy. Vitamin A is for vision, D for calcium, K for clotting.

Explanation:
The skeletal system, composed of bones and cartilage, provides structural support for the body, protects vital internal organs (like the brain and heart), and serves as a site for muscle attachment. The muscular system, consisting of skeletal, smooth, and cardiac muscles, contracts to produce movement of the body and internal organs. The endocrine system comprises glands that secrete hormones directly into the bloodstream to regulate various physiological processes. All statements are correct.

Explanation:
Lysosomes are single-membrane-bound organelles containing hydrolytic enzymes. Mitochondria, chloroplasts, and the nucleus are double-membrane-bound. Peroxisomes, vacuoles, and the endoplasmic reticulum are also single-membrane structures. The single membrane of lysosomes helps maintain an acidic pH (5.0) for enzyme activity and protects the cell from autolysis.