The human body functions as a whole, but it is composed of many separate functional units that must work together.
The smallest and mot basic unit of life is called the cell.
Cells have three parts:
the cell membrane
All the cell have three functions:
movement of fluid thought the cell membrane
Groups of similar cells form tissues:
Epithelium main function protection.
Connective tissue supports and shapes the body.
Muscle tissue enable movement.
Nerv tissue transmits eletrical impulses in the body.
In the body there are a lot of organs that form systems.
In our body are nine systens:
I.) The musculoskeletal systém
a.) the sceletal systém
a frameworks for the body
protects vital organs
consists of bones and joints
b.) the muscle system
its functions are connected with skeletal systém
the purpose of it – a movement (coused by contraction and extension muscles)
II.) The circulatory systém
consists of the heart and a network of blood vessels:
III.) The digestive systém
consists of: the mouth, the oesophagus, the stomach, small and large intestine, the anus
IV.) The respiratory systém
consists of: the nose, the nosopharynx, the trachea, the bronchi and the lungs
V.) The urinary systém
consists of: the kydneys, the ureters, the bladder and the urethra
VI.) The nervous systém
consists of: the brain, the spinal cord (peripheral nerves, automic nerves)
VII.) The endocrine systém
consists of: seven glands that produce hormones
VIII.) The reproductive systém
there are two systems (male´s and female´s)
IX.) The integumentary systém
protects the body agains injury = the skin
Organs of the body are positioned withen spaces called cavities: