Biology: Specialized Cells and Their Jobs
How cell structures help cells perform specific functions
Biology: Specialized Cells and Their Jobs
How cell structures help cells perform specific functions
Biology - Grade 6-8
- 1
A red blood cell has a flexible shape and no nucleus. Its main job is to carry oxygen through the bloodstream. Explain how these features help it do its job.
Think about where blood cells must travel and what they need to carry.
A red blood cell's flexible shape helps it squeeze through tiny blood vessels. Having no nucleus gives it more space to carry hemoglobin, which holds oxygen. - 2
A nerve cell, also called a neuron, has long branches that connect to other cells. What job does this shape help the nerve cell perform?
The long branches help a nerve cell send and receive messages over distances in the body. This shape helps the nervous system communicate quickly. - 3
Muscle cells contain many mitochondria. Explain why muscle cells need so many mitochondria.
Mitochondria are often called the energy producers of the cell.
Muscle cells need many mitochondria because they use a lot of energy to contract and move the body. Mitochondria release energy from food for the cell to use. - 4
Root hair cells in plants have long, thin extensions that reach into the soil. What substances do root hair cells absorb, and how does their shape help?
More surface area means more contact with the soil.
Root hair cells absorb water and minerals from the soil. Their long, thin extensions increase surface area, which helps them take in more materials. - 5
A leaf cell that performs photosynthesis contains many chloroplasts. What is the job of the chloroplasts in this specialized cell?
Chloroplasts capture light energy from the Sun and use it to help make sugar during photosynthesis. This helps the plant produce food. - 6
White blood cells protect the body from disease. Some white blood cells can change shape and surround germs. Explain how this ability helps the body.
Think about how a cell might trap something smaller than itself.
Changing shape helps some white blood cells move toward germs and surround them. This allows the white blood cells to destroy or remove harmful invaders. - 7
Sperm cells have a tail-like flagellum and many mitochondria near the base of the tail. How do these structures help sperm cells carry out their job?
The flagellum helps the sperm cell swim. The mitochondria provide energy for movement so the sperm cell can travel to an egg cell. - 8
An egg cell is much larger than many other animal cells and contains stored nutrients. Why is this important for its function?
Think about what a developing embryo needs at the very beginning.
An egg cell is large and stores nutrients because it must support the early development of a new organism after fertilization. The stored materials help the first cell divisions occur. - 9
Skin cells are flat and fit closely together. What job does this arrangement help skin cells perform?
Flat skin cells that fit closely together form a protective barrier. This helps keep harmful substances out and helps prevent water loss. - 10
Ciliated cells line parts of the respiratory system. They have tiny hair-like structures called cilia that move back and forth. What job do ciliated cells perform?
Cilia act like tiny moving brushes.
Ciliated cells move mucus and trapped dust or germs out of the respiratory system. Their cilia sweep materials away from the lungs. - 11
Xylem cells in plants are tube-like cells that help move water upward from the roots. Explain how their structure supports this function.
Xylem cells form long tubes that allow water to move through the plant. Their tube-like shape creates a pathway from the roots to the stems and leaves. - 12
Guard cells are found around tiny openings in leaves called stomata. They can change shape to open or close the stomata. Why is this important for the plant?
Plants need carbon dioxide, but they can also lose water through leaf openings.
Guard cells help control when gases enter and leave the leaf. They also help reduce water loss by closing the stomata when needed. - 13
Compare a nerve cell and a red blood cell. Describe one way their structures are different and explain how each difference matches its job.
Focus on shape, size, or cell parts.
A nerve cell has long branches for sending and receiving messages, while a red blood cell is small and flexible for moving through blood vessels. Each cell's structure helps it perform its specialized job. - 14
A student says, "All cells in a multicellular organism do the same job because they all have cell membranes and cytoplasm." Explain why this statement is incorrect.
The statement is incorrect because cells can share basic parts but still have different structures and functions. Specialized cells have features that help them perform specific jobs, such as carrying oxygen, sending messages, or absorbing water. - 15
Choose one specialized cell from this worksheet and write a short explanation of how its structure is related to its function.
Use this pattern: The cell has this structure, so it can do this job.
A correct answer should name a specialized cell and explain how at least one structure helps it do its job. For example, a root hair cell has a long extension that increases surface area, which helps it absorb more water and minerals from the soil.