1.
a. Integumentary system - skin, nails, hair, glands
b. Skeletal system - bones
c. Muscular system - muscles
d. Nervous system - brain, nerves, spinal cord, sensory organs
e. Endocrine system - gonads, glands (pineal, parathyroid, thyroid, adrenal), hypothalamus
f. Cardiovascular system - heart, arteries, veins, capillaries
g. Lymphatic system - vessels, nodes, ducts, tonsils, spleen, lymph fluid, bone marrow
h. Respiratory system - lungs, trachea, nose, mouth, throat, voice box
i. Digestive system - mouth, esophagus, stomach, intestines (small, large), liver, gallbladder, rectum/anus
j. Urinary system - kidneys, bladder
k. Reproductive system - uterus, ovaries, fallopian tubes (females), penis, testes, prostate (males)
2. The cardiovascular, respiratory, and urinary systems all help regulate the Acid-Base balance in the body.