The respiratory system are made up of those tubes that transport air in and out of the lungs, and microscopic sack where gasses are exchanged
There are five main layers of the epidermis; they include the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
A cavity is a structure surrounded by bones and muscles within a space or soft organs and glands. There are four main cavities in the human body, they include Cranial cavity, Thoracic cavity,
The brain is divided into four major parts. The cerebrum, brain stem, diencephalon and the cerebellum.
Digestive system can be defined as the system that consist of the alimentary canal which extends from the mouth to the anus, and several accessary organs