The integumentary system is composed of skin and associated structures (like hair, fingernails, and toenails), sweat glands, and oil glands. The skeletal system is composed of bones. The muscular system is made up of skeletal muscle tissues, which are typically attached to bones, and other muscle tissues such as smooth and cardiac. The brain, spinal cord, nerves, and special sense organs like eyes and ears are the components of the nervous system. In the endocrine system, hormone-producing glands such as the pineal gland, hypothalamus, pituitary gland, thymus, thyroid gland, parathyroid glands, adrenal glands, pancreas, ovaries, and testes along with several other organs work together to perform their function. The cardiovascular system is composed of the heart, and blood vessels. The lymphatic system is constituted of the following organs: lymphatic vessels, spleen, thymus, lymph nodes, and tonsils. The lungs, pharynx, larynx, trachea, and bronchial tubes are the organs that comprise the respiratory system. Going to our digestive system, this system is composed of several organs such as the mouth, pharynx, esophagus, stomach, small and large intestines, anus, salivary glands, liver, gallbladder, and pancreas. Kidneys, ureters, urinary bladder, and urethra are the organs that form the urinary system. For our reproductive system, the organs between males and females vary at some point: For males, the testes, epididymis, ductus deferens, seminal vesicles, prostate, and penis; however, the organs for females are ovaries, uterine tubes, uterus, vagina, and mammary glands.
The organ systems that function to regulate acid-base balance in body fluid are the cardiovascular system, respiratory system, and urinary system as these systems involve the main organs that regulate acid-base balance such as kidneys and lungs.