The penis is primarily part of the Reproductive System but is also part of the Urinary System because the penis has two primary functions.
The genitourinary system.
The digestive system contains the liver.
Circulatory System
The White Blood Cells form in the lymphoid organ because the lymph system is not a closed system and contains a fluid called the lymph.
The digestive system contains the small intestine. It is a vital organ for nutrient absorption in the body.
The olfactory system.
Digestive system.
the digestive system
skeletal system
Circulatory System.
The eye contains the Retina
The skin is part of the Integumentary System, and is the largest organ in the body.