The human internal organs diagram includes the following organs and structures:

• Brain: The control center of the nervous system that is responsible for regulating body functions and controlling behavior.
• Lungs: The respiratory organs that take in oxygen and expel carbon dioxide.
• Heart: The muscular organ that pumps blood throughout the body.
• Liver: The largest glandular organ in the body that produces bile to aid in digestion and detoxifies harmful substances in the blood.
• Stomach: The muscular sac-like organ that mixes and grinds food with digestive enzymes and acid.
• Small intestine: The long, narrow tube where most of the digestion and absorption of nutrients occurs.
• Large intestine: The wider tube that absorbs water and electrolytes from undigested food and forms feces for elimination.
• Kidneys: The pair of bean-shaped organs that filter waste products from the blood and produce urine.
• Bladder: The muscular sac that stores urine until it is eliminated from the body.
• Pancreas: The glandular organ that produces hormones and enzymes to regulate blood sugar levels and aid in digestion.
• Spleen: The organ that helps filter blood and stores white blood cells to fight infection.
• Gallbladder: The small sac-like organ that stores and releases bile to aid in digestion.
• Adrenal glands: The pair of glands that produce hormones that help regulate the body’s response to stress.
• Thyroid gland: The gland that produces hormones that regulate metabolism and growth.
• Reproductive organs: The organs that produce and transport gametes (sperm or eggs) for reproduction, including the ovaries, uterus, fallopian tubes, testes, prostate gland, and penis.