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Questions and Answers
What is the main characteristic of unicellular organisms?
What is the main function of nerve tissue in the heart?
What is the term for a collection of cells that perform the same function?
What is the highest level of organisation in the human body?
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What is the function of the digestive system?
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What is the term for a structure that contains more than one type of tissue working together?
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What is the term for the level of organisation that consists of multiple cells?
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What is the term for the level of organisation that consists of functionally related organs?
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Study Notes
Unicellular and Multicellular Organisms
- Unicellular organisms consist of one cell only, examples include Amoeba and Paramecium.
- Multicellular organisms consist of multiple cells, examples include humans, animals, and plants.
Cellular Organisation in Multicellular Organisms
- In multicellular organisms, cells need to communicate with each other to coordinate and control bodily functions.
- Cells combine to form more complex, higher-order structures.
Levels of Organisation
- The human body has multiple levels of organisation: cells, tissues, organs, and organ systems.
- This organisation allows for digestion, movement, nutrient transport, and waste excretion.
Tissues
- A tissue is a collection of cells that perform the same function.
- Examples of tissues include muscle tissue (formed by muscle cells) and nerve tissue.
- Humans have four main types of tissues: muscle, nerve, connective, and epithelial tissue.
Organs
- An organ is a structure that contains more than one type of tissue working together.
- Examples of organs include the heart, which contains cardiac muscle tissue, nerve tissue, and connective tissue.
Organ Systems
- An organ system is a group of functionally related organs.
- Examples of organ systems include the digestive system, which consists of the stomach, mouth, oesophagus, small intestines, and large intestines.
- The digestive system's function is to digest food and release nutrients.
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Description
Learn about the differences between unicellular and multicellular organisms, including examples and characteristics of each. Discover how cells communicate and coordinate in the human body.
