The human body has many different things that come in pairs, including:
Lungs: The human body has two lungs, which are located on either side of the chest and are responsible for bringing in oxygen and expelling carbon dioxide.
Kidneys: The human body has two kidneys, which are located in the lower back and are responsible for filtering waste products from the blood and regulating the balance of fluids in the body.
Eyes: The human body has two eyes, which are located on either side of the head and are responsible for providing vision.
Ears: The human body has two ears, which are located on either side of the head and are responsible for hearing.
Arms: The human body has two arms, which are located on either side of the body and are responsible for movement and manipulation of objects.
Legs: The human body has two legs, which are located on either side of the body and are responsible for movement and support.
Noses: The human body has two nostrils, which are located on either side of the face and are responsible for sensing smell and helping to filter air before it reaches the lungs.
Brains: The human body has two cerebral hemispheres, which are responsible for different functions such as perception, motor control, language, memory and more.
Ovaries: The human body has two ovaries, which are located in the lower abdomen and are responsible for producing eggs and hormones such as estrogen and progesterone.
Testes: The human body has two testes, which are located in the scrotum and are responsible for producing sperm and hormones such as testosterone.
Adrenal glands: The human body has two adrenal glands, which are located on top of each kidney and are responsible for producing hormones such as adrenaline and cortisol.
Thyroid glands: The human body has two thyroid glands, which are located on either side of the trachea and are responsible for producing hormones that regulate metabolism.
Parathyroid glands: The human body has four parathyroid glands, two on each lobe of the thyroid gland, and are responsible for regulating the balance of calcium in the body.
Pancreas: The human body has one pancreas, which is located behind the stomach and is responsible for producing insulin and other hormones that regulate blood sugar levels, as well as producing enzymes that aid in digestion.
Hearts: The human body has one heart, which is located in the chest and is responsible for pumping blood throughout the body.
Collagen: The human body has two types of collagen, Type I and Type II, which are responsible for providing structure and support to the skin, bones, tendons, and other tissues.
This list is not exhaustive, the human body is a complex system that contains many different structures and organs, many of which come in pairs.