systems

2.4 human as complex organism
1. A human being, also human or man is a member of a species of bipedalprimates in the family Hominidae (taxonomically

2. Humans have a highly developedbrain, capable of abstract reasoning, language, introspection and problem solving.

3. This mental capability, combined with an erect body carriage that frees the forelimbs (arms) for manipulating objects, has allowed humans to make far greater use of tools than any other species.

4. Humans are particularly adept at utilizing systems of communication — primarily spoken, gestural, and written language — for self-expression, the exchange of ideas, and organization. Humans create complex social structures composed of many cooperating and competing groups, from families to nations.

5. Social interactions between humans have established an extremely wide variety of traditions, rituals, ethics, values, social norms, and laws, which together form the basis of human society.

6. Humans have a marked appreciation for beauty and aesthetics, which, combined with the desire for self-expression, has led to cultural innovations such as art, writing, literature and music.

7. Humans are the only species known to build fires, cook their food, and clothe themselves; as well as utilize numerous other technologies.

8. Humans pass down their skills and knowledge to the next generations and so are regarded as dependent upon culture.

Body System

The systems of the human body consist of:

* Circulatory system/Cardiovascular system
* Digestive system
* Endocrine system
* Immune system/Lymphatic system
* Integumentary system
* Muscular system
* Nervous system
* Reproductive system
* Respiratory system
* Skeletal system
* Urinary system
* Sensory system
* Excretory System

2.3 tissue, organs- organization

1. Tissue is a cellular organizational level intermediate between cells and a complete organism.

2. Hence, a tissue is an ensemble of cells, not necessarily identical, but from the same origin, that together carry out a specific function.

3. Organs are then formed by the functional grouping together of multiple tissues.

The study of tissue is known as histology or, in connection with disease, histopathology.to form a s

4. A group of different organs combine together to form a system.

unit 2.2 unicell and multicell

1. Organisms mean living things.

2. Unicellular means one cell - amoeba, euglena, yeast.

Amoeba - one cell

3. Multicellular means many cells - hydra, worms, birds.

4. Microorganism can only be seen under a microscope, a very minute objects and carries out all the living processes.

5. Life processes include movement, feeding, excrfeting, growth, respiration,reproduction and response towards stimulus.

Red algae- multicellular organism.

Hydra species Hydra - animal with many cell