"Animal Cell" Cell is the basic unit of life activity PPT courseware 4

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"Animal Cell" Cell is the basic unit of life activity PPT courseware 4

Review: How to make a temporary film

Wipe → drip → tear → unfold → cover → dye → absorb

basic structure of plant cells

Review the past to learn something new and ask questions:

①Want to see the cells in your body?

②What are the similarities and differences between human cells and plant cells?

By studying this section, you will know:

1. How to make temporary animal cell slides?

2. What is the basic structure of animal cells?

3. What are the similarities and differences in the basic structures of animal cells and plant cells?

Experiment: Observing human oral epithelial cells

Purpose requirements:

1. Make and observe temporary mounts of human oral epithelial cells.

2. Understand the basic structure of human oral epithelial cells.

Materials and tools:

Physiological saline, dilute iodine solution, sterilized toothpicks, droppers, gauze, tweezers, absorbent paper, slides, cover slips, microscope.

Method steps:

1. Wipe the slides and coverslips clean with clean gauze.

2. Put a drop of normal saline in the center of the slide.

3. Use a sterilized toothpick to gently scrape the inner wall of your cleaned mouth a few times. Place the chipped end of the toothpick in the saline solution on the slide and dab it lightly.

4. Use tweezers to pick up the cover slip so that one side of it contacts the water droplet on the slide first, and then slowly lay the cover slip flat to cover the water droplet. Take care to avoid air bubbles under the coverslip.

5. Add a few drops of dilute iodine solution to one side of the coverslip, and use absorbent paper to absorb it on the other side of the coverslip so that the iodine solution infiltrates the entire specimen.

Discussion 1:

When making temporary mounts of human oral epithelial cells, why should we use physiological saline? Is it okay to use clean water?

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. The mass fraction of physiological saline required for mammalian (including human) cells is 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.

Discussion 2:

Why is it necessary to use dilute iodine solution to stain human oral epithelial cells?

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.

Discussion three:

What is the basic structure of human oral epithelial cells?

The basic structure of human oral epithelial cells includes: cell membrane, cytoplasm, nucleus, and the cytoplasm contains mitochondria, etc.

Simulation production: making animal cell models

Please prepare water, edible agar, crab apple (or hawthorn, green plum, etc.) preserved fruits, novel plastic food bags, thread and other items in advance. Then follow the steps below.

1. Heat water and edible agar first to form a sol, then pour part of the colloidal agar into a small plastic bag. Unused agar should be kept warm, otherwise the gelatinous agar will solidify as it cools.

2. When the agar in the plastic bag is about to solidify, put a preserved crab apple into the bag, and then inject another part of the agar solution.

3. Tie the mouth of the plastic bag with thread. After the agar sol solidifies, the animal cell model is ready.

【Standard Compliance Test】

1. A classmate observed a cell under a microscope. This cell has a cell wall, cell membrane, cytoplasm, nucleus and vacuoles. This kind of cell is definitely not ( )

A. Onion epidermal cells B. Cucumber epidermal pulp cells

C. Hydrilla leaf cells D. oral epithelial cells

2. Use a microscope to observe the following fixed slides. The cell wall cannot be seen ( )

A. Root tip cells B. Mesophyll cells C. Blood red blood cells D. Stem epidermal cells

3. The correct sequence for making temporary mounts of human oral epithelial cells is ( )

①Drop a drop of water in the center of the slide ②Drop a drop of normal saline in the center of the slide

③Use a sterilized toothpick to gently scrape the side wall of the mouth a few times

④Put the toothpick in the droplet on the glass slide and apply it evenly a few times

⑤ Add drops of iodine solution for staining ⑥ Cover with a coverslip

A. ①③④⑥⑤ B． ②③④⑥⑤ C. ①③④⑤⑥ D． ②③④⑤⑥

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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: 2024-11-26

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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