Organisation: several tissues can form one organ
הוצג| English | משמעות |
|---|---|
| tissue/ˈtɪʃuː/ | רקמה |
| organ system/ˈɔːɡən ˈsɪstəm/ | מערכת איברים |
What would explain this observation?
- The stomach contains several tissue 组织 types working together. Calling it a tissue misses the way its different parts cooperate.
Build the model
- Cells are the basic building blocks of living organisms.
- A tissue is a group of cells with similar structure and function.
- An organ contains different tissues performing a specific function.
- Organs work together in organ systems 器官系统, and those systems cooperate in the whole organism.
- tissue: A group of cells with similar structure and function.
- organ system: A group of organs working together.
Which level contains several tissues working together for a function?
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
An organ, such as the stomach or a leaf, is defined as several tissues working together at one function. A single cell or molecule sits lower in the hierarchy.
Match each technical term to its precise meaning.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- In the digestive system, organs including the stomach and small intestine work together to digest and absorb food.
- Within an organ, muscle tissue can move contents while glandular tissue releases substances.
- A list of levels becomes an explanation when each example is placed at the correct level.
In the lab: Use a provided organ description to classify its components. Compare the scale of a cell image with an organ image using their own scale bars; do not compare raw displayed widths. Build a chain using the same organism and explain the role of each level.
Which two habits make the investigation or model in this case more defensible?
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Stating the conditions and assumptions lets others repeat the work exactly, and recording the supporting evidence lets them check the conclusion. Hiding disagreeing results removes the evidence that could challenge a wrong conclusion, and one measurement can never establish a wider claim.
Work from known quantities
- Known: a model cell is 0.02 mm wide, while a tissue strip is 2 mm wide.
- Length ratio =2/0.02=100.
- This is a scale comparison, not a claim that the tissue contains exactly 100 cells: their arrangement and third dimension have not been specified.
Your turn: A 3 mm tissue strip is compared with a 0.03 mm cell. Calculate their length ratio.
A 3 mm tissue strip is compared with a 0.03 mm cell. Calculate their length ratio.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
The result is 100 . Known: tissue strip 3 mm; cell 0.03 mm. Length ratio = 3/0.03 = 100. This compares lengths; it does not claim the strip contains exactly 100 cells.
Check the conclusion and its limits
- An organ is not necessarily made from one tissue type.
- A named blood vessel is an organ structure, while blood is a tissue.
- Real organ boundaries and cooperating systems can overlap in function without changing the meaning of the hierarchy.
Not true: Every organ consists of only one type of tissue. Organs combine tissues: the stomach wall alone includes muscle, epithelial and connective tissues. One tissue type would make it a tissue, not an organ.
- Cells are the basic building blocks of living organisms.
- In the digestive system, organs including the stomach and small intestine work together to digest and absorb food.
- Watch for: an organ is not necessarily made from one tissue type.
Organs combine tissues: the stomach wall alone includes muscle, epithelial and connective tissues.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
True. Organs combine tissues: the stomach wall alone includes muscle, epithelial and connective tissues. One tissue type would make it a tissue, not an organ.
A group of cells with similar structure and function: write the technical term.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
tissue means A group of cells with similar structure and function.