Principles Of Organisation
Bayani Gaba-gaba
A single cell can get everything it needs straight through its surface. Make an organism out of billions of cells and that stops working: the cell in the middle is a long way from the outside world. Large organisms solved this by building levels of organisation, and by dedicating whole structures to exchanging materials with the surroundings.
In this lesson you will follow the ladder from cell to tissue to organ to organ system, and see why each rung exists. You will meet differentiation, the process by which cells that start out identical take on different jobs, and you will get a feel for the sizes involved, which is what turns this from vocabulary into understanding. It is a short piece of specification that pays for itself many times over: the definitions it gives you are reused in every biology topic that follows.
Manufura
- Large multicellular organisms develop systems for exchanging materials. During the development of a multicellular organism, cells differentiate so that they can perform different functions.
- A tissue is a group of cells with similar structure and function.
- Organs are made of tissues. One organ may contain several tissues.
- Organ systems are groups of organs that perform a particular function. Students should develop an understanding of size and scale in relation to cells, tissues, organs and systems.
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Nazarin Darasi
Barka da kammala darasi akan Principles Of Organisation. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- What is a tissue? A. A group of organs working together B. A group of cells with similar structure and function C. A structure made of several different tissues D. A single specialised cell Answer: B
- Which of these is an organ system? A. The stomach B. Muscular tissue C. The digestive system D. A gland cell Answer: C
- What happens during differentiation? A. Cells divide to produce identical copies B. Cells become specialised to perform different functions C. Cells lose their genetic material D. Cells increase in number only Answer: B
- Why do large multicellular organisms need exchange surfaces? A. Their cells do not respire B. Their surface area to volume ratio is too small C. Their cells are larger than those of small organisms D. They contain fewer types of tissue Answer: B
- How many micrometres are there in one millimetre? A. 10 B. 100 C. 1000 D. 10000 Answer: C
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