Circulatory

Heart, blood vessels, and blood

Digestive

Stomach, intestine, liver, pancreas

Endocrine

Thyroid gland, adrenal gland

Immune

Thymus, spleen, lymph nodes

Intergumentary

skin protection from external environment

Musculoskeletal

skeletal muscle bone

for support and movement

Nervous

Brain, spinal cord

for coordination of body function through electrical signals and release of regulatory molecules

Reproductive

Ovaries and uterus and testes

perpetuation of species

respiratory

lungs and airways

for exchange of oxygen and carbon dioxide between internal and external environments

urinary

kidneys bladder

for maintenance of water and solutes in the internal environment; waste removal