| Category | Format | Size |
|---|---|---|
| People's Education Edition seventh grade biology volume 1 | pptx | 6 MB |
"Animal Cell" Cell is the basic unit of life activity PPT courseware 5
Description
"Animal Cell" Cell is the basic unit of life activity PPT courseware 5
Think about it, discuss it
The picture below shows three types of frog cells observed under a microscope.
What do the structures of these three animal cells have in common? How is it different from plant cells?
What is saline used for?
The concentration of 0.9% physiological saline is basically the same as that of human extracellular fluid. It can maintain the normal physiological state of cells. A concentration less than 0.9% will cause cells to overabsorb water and swell and rupture; a concentration greater than 0.9% will cause cells to deform due to dehydration.
discuss
1. When making temporary mounts of human oral epithelial cells, why should we use physiological saline? Is it okay to use clean water?
Answer: Different animal cells live in different liquid environments. Different liquid environments have different osmotic pressures. Physiological saline refers to a sodium chloride solution commonly used in physiological experiments or clinical practice, whose osmotic pressure is equal to that of animal or human plasma. Mammalian cells (including humans) require a mass fraction of saline of 0.9�. In such physiological saline, human cell morphology and function can remain normal. If exposed to clear water, human cells will absorb water and swell.
2. Why is it necessary to use dilute iodine solution to stain human oral epithelial cells?
Answer: Human oral epithelial cells are flat and generally appear colorless under a light microscope, making it difficult to observe their internal structure. After staining with dilute iodine solution, clear cell nuclei can be seen.
3. What is the basic structure of human oral epithelial cells?
Answer: The basic structure of human oral epithelial cells includes: cell membrane, cytoplasm, nucleus, mitochondria, etc.
My question?
1. What should you drop in the center of the slide? What is the purpose? What is the concentration?
saline. Purpose: Keep the cell's original shape. The concentration is 0.9%.
2. Where are the oral epithelial cells scraped? Why should you rinse your mouth before scraping material? What should you pay attention to when scraping?
The inner wall of the human oral cavity. Remove food particles from the mouth. Scrape gently a few times to avoid damaging the mucous membrane on the inner wall of your mouth.
3. What is the purpose of placing the end with the debris attached in the water droplet on the slide and spreading it evenly?
Disperse the cells to avoid overlapping and affecting observation.
4. When using a microscope to observe human oral epithelial cells, should the field of view of the microscope be brighter or darker? Why?
dark! In order to make the boundaries between cells obvious and easy to observe.
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For more information about the PPT courseware "Cells are the basic unit of life activities, animal cells", please click the Cells are the basic units of life activities ppt animal cells ppt tag.
"Structure and Function of Human and Animal Cells" PPT courseware:
"Structure and Function of Human and Animal Cells" PPT courseware Part 1: Review 1. Structure of plant cells 2. Functions of plant cells Answers 1. Onion epidermal cells are approximately rectangular. What structure maintains the shape of the cells? 2. Substances that can benefit...
"Structure and Function of Human and Animal Cells" PPT:
"Structure and Function of Human and Animal Cells" PPT Part One Content: Observation: Human Oral Epithelial Cells Discussion: Experimental Steps for Observing the Structure of Human Oral Epithelial Cells Tips: 1. The steps for observing the structure of onion scale leaf epidermal cells can be used as a reference. 2. Reading textbook P3..
"Animal Cell" Cell is the basic unit of life activity PPT courseware 7:
"Animal Cells" Cells are the basic units of life activities PPT courseware 7 Preview outline 1. What are the steps for making temporary mounts of human oral epithelial cells? 2. What are the basic structures of human oral epithelial cells? 3. What is the structural difference between animal cells and plant cells?
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Update Time: 2024-07-29
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