Bones are a key part of your skeletal system. They’re lightweight structures that are incredibly strong. A normal adult has around 206 bones in their body. Your bones join together to make your ...

Your sympathetic nervous system is one of the branches of your autonomic nervous system. It controls functions under unconscious control related to “fight or flight.” Your nervous system plays a ...

The integumentary system is the physical system that forms the barrier between the external environment and the internal systems of the body. In humans, this system consists of skin, hair, nails, and ...

The endocrine system is the name for the glands that produce hormones in a person’s body. These glands include the thyroid gland, pituitary gland, and adrenal gland. The endocrine system produces ...

In a recent study published in the journal PNAS, researchers examined the relationship between cell size and count across the human body, establishing a quantitative framework and uncovering ...