1.
a. Integumentary system - Skin and associated structures, such as hair, fingernails and toenails, sweat glands, and oil glands.
b. Skeletal system - Bones and joints of the body and their associated cartilages.
c. Muscular system - skeletal muscle and tendon
d. Nervous system - Brain, spinal cord, nerves, and special sense organs, such as eyes and ears.
e. Endocrine system - Hormone-producing glands (pineal gland, hypothalamus, pituitary gland, etc.) and hormone-producing cells in several other organs.
f. Cardiovascular system - Blood, heart, and blood vessels.
g. Lymphatic system - Lymphatic fluid and vessels, spleen, thymus, lymph nodes, tonsils, and cells that carry out immune responses
h. Respiratory system - Lungs, pharynx, larynx, trachea, and bronchial tubes.
i. Digestive system - mouth, pharynx, esophagus, stomach, small and large intestines, anus, salivary glands, liver, gallbladder, and pancreas
j. Urinary system - Kidneys, ureters, urinary bladder, and urethra
k. Reproductive system - males: testes, epididymides, ductus deferens, seminal vesicles, prostate, and penis; females: ovaries, uterine tubes, uterus, vagina, and mammary glands
2. Organ systems that help regulate acid-base balance in body fluid are cardiovascular system, respiratory system, and urinary system.