The Human Body Apr 2026

The body requires a constant supply of energy and raw materials. The is a 30-foot-long tube that begins at the mouth and ends at the anus. Enzymes in saliva, stomach acid, and intestinal juices break down food into microscopic molecules—glucose, amino acids, fatty acids—which are then absorbed into the blood.

The is a silent army of specialized cells (white blood cells like macrophages, T-cells, and B-cells) and organs (spleen, lymph nodes) that patrol the body, identifying and destroying invaders like bacteria, viruses, and even cancerous cells. The Human Body

While the nervous system provides rapid, electrical signals, the provides slower, chemical communication via hormones. Glands like the pituitary (the "master gland"), the thyroid, and the adrenals release these chemical messengers into the blood to regulate growth, metabolism, mood, sleep, and reproduction. The body requires a constant supply of energy