Cell Structures
Cell Structures Objectives
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Identify various organelles within a cell.
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Match different cellular activities to specific organelles.
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Describe the structure of the plasma membrane including how it relates to diffusion.
A ______ is a group of cells, like this group of fat cells (adipocytes).
What are the functions of each of these four general tissue types in the human body?
What is a misconception?
Why is thinking that eating a completely fat-free diet a misconception?
All organisms are made of cells from a single-celled bacterium to a human with trillions of cells. Many features are similar, even between two dramatically different species like an animal and a plant.
From this video, list three differences between the animal and plant cell.
You can select the closed captioning “cc” option if you would like to see the text.
Cells and their organelles maintain homeostasis (balance) in the body.
These are six of the organelles:
Nucleus
Mitochondrion
Endoplasmic Reticulum
Golgi Complex
Lysosome
Vesicle
This video shows the organelles within an animal cell.
Now, use your notes and check your knowledge of cell structures.
The plasma membrane that surrounds cells has to let some things into the cell, move some substances out of the cell, and block other substances completely. This video introduces the process of diffusion.
The plasma membrane has structural features that make diffusion and active transport possible.
You can select the closed captioning “cc” option if you would like to see the text.
The plasma membrane consists of two layers of phospholipids. Each phospholipid molecule has two parts, commonly referred to as the “head” and the “tail.”
The heads are water-soluble and face outward, and the tails are water-insoluble and face inward.
Some substances move simply across membranes; other need to travel with the assistance of proteins embedded in the phospholipid membrane.
Simple Diffusion
Protein Assistance
Looking for something to do at home with family? Make a cell model! This one is out of candy and jello.
Consider making your own representation of a cell (or skin model in the next section). Add a caption description and you can use it to help answer quiz questions and also add it to your final course portfolio.
Would you like to test your knowledge of cellular structures? If so, there are a few more reference videos in this guide’s resource page.
The next section introduces different cellular shapes as well as cellular life stages.
Check your knowledge. Can you:
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identify various organelles within a cell?
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match different cellular activities to specific organelles?
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describe the structure of the plasma membrane including how it relates to diffusion?