Human actuality

Classified in Biology

Written at on English with a size of 2 KB.

Non-infectious illnesses

They are not caused by pathogens (viruses, bacteria, protozoans, fungi...)
Causes: internal causes: (congenital conditions, aging: some cancers)
External causes: (accidents, lifestyle, environment: injuries, cancer...)
Transmission: Not trasmitted between human beings, because they are not contagious( traumas) but some of them are genetic disease ( hereditary)
Functions: Robert Brown discovered the nucleus in 1831 and defined it as an essential membanous organelle: It contains hereditary information (dna)
It controls cell activity (cell functions) through DNA
Structures: Depends on weather cells are in a state of diviosn (mitosis) or not (interphase): Interphase nucleus:Basic structure and mitotic nucleus in division
Nuclear membrane: Covering formed by two membranes covered in ribosomes. Has pores that allow substances to be exchange between the nucleus and the cytoplasm.  Nucleoplasm: Is the liquid in the nucleus
Nucleolus: Is a rounded and dark structure where the components of the ribosomes are created.  Chromatin: Is made up of DNA filaments and proteins and contains genetic imformtation. During cell division, it condenses and forms chromosomes

Entradas relacionadas: