Principles Of Organisation
Akopọ
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.
Awọn Afojusun
- 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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Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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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