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THE HUMAN BODY
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 cytoplasm the cell membrane the nucleus
All the cell have three functions:
reproduction movement of fluid thought the cell membrane metabolism
Groups of similar cells form tissues:
epithelium connective tissues muscle tissues nerv 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:
arteries capillaries veins
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: the cranial the spinal the thoracic the abdominal the pelvic