This page shows questions in the Cells Under a Microscope public release module at MSDE. 8th Grade MISA
"Cells Under a Microscope"
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During a class investigation on cells, students observed different cell types using a compound light microscope and prepared slides. The following diagrams show some of the cells the students observed.
After examining the cells using a microscope, the students researched some of the cells observed. The students found that each individual amoeba is able to carry out all the functions necessary for life. The amoeba moves by changing the position of its cytoplasm. The amoeba uses cellular respiration to convert food into energy. Another organism that is similar to the amoeba is the euglena. Each individual euglena is able to carry out all necessary functions for life. One of the ways the euglena differs from the amoeba is that the euglena uses photosynthesis to produce the energy needed for its survival. Another way the euglena differs from the amoeba is in movement. The euglena has a tail, called a flagella, that propels the euglena.
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As the students continued their research, they found evidence that indicated that humans and other complex organisms have many cells that are found in only one system of an organism’s body. Their research also stated that it is estimated that on average 37.2 trillion cells compose a human body. Some of these cells are intestinal cells, heart muscle cells, and nerve cells. These cell types are shown in the following diagram.
The students also found that researchers are trying to determine the number of different cell types there are in the human body. Until recently, scientific evidence supported the claim that the human body has approximately 200 cell types, each with a unique function. Researchers are now analyzing the different cell types and have found that there are many more types than previously thought.
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During the microscope investigation, the students observed the amoeba and euglena.
The observations on the amoeba and euglena provide evidence that
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During the microscope investigation, the students observed cells.
Evidence from the investigation supports the classification of humans and onions as
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The students continued using the microscope and compared table salt to the onion cells they previously observed. A diagram of the table salt is shown.
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The students’ research indicated that heart muscle cells are only one type of cell in the circulatory system and that the circulatory system is composed of several organs working together.
Which other circulatory system organ works directly with the heart to ensure other body tissues receive oxygen?
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The students' research indicated that the human body is composed of cells.
Place each body structure into the table in order of least complex organization to most complex organization.
| Least Complex Organization | → | → | → | Most Complex Organization |
|---|---|---|---|---|
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The students found that intestinal cells are part of an organ in the digestive system.
Use evidence to explain how the intestinal cells help the intestines work within the digestive system. In your explanation, be sure to include
- the role of the intestines in the digestive system
- the interacting components in the intestines