Cells to Systems

Lesson 1

Cells to Systems

What things need to happen in a cell for it to live?

Cells to Systems

Purpose• We are going to read about cells, the smallest

living parts of a plant or animal. • The purpose for reading, is to discover what a

cell is made of, what a cell needs, and what a cell does.

Cells to Systems

Quick Summary

• A cell is the basic building block of living things.

• Cells need a way to take in food, turn the food into energy, and get rid of waste products.

• Cells combine oxygen and food to get energy, a process called cellular respiration.

Cells to Systems

• What are two functions of every cell?• During cellular respiration in humans, what gas is

used by the cell and what gas is produced by the cell?

• What would happen to a cell that receives no more oxygen or food?

• What is the most basic unit of living things? • Suppose you saw a small organism move across your

desk. Would you infer that this organism was multicellular or a single cell?

Bill Nye Cells

http://www.youtube.com/watch?v=y8gZCTjAbVs

Cells to Systems

• Quick Summary– Some common cell parts of plant and animal cells

include the nucleus, mitochondria, cell membrane, vacuole, and cytoplasm.

– Plant cells contain chloroplasts and a cell wall, cell parts not found in animal cells.

– A cell's nucleus is its control center; its mitochondria are energy producers; the cytoplasm holds smaller parts in the cell; the vacuole provides storage; and the cell membrane holds the contents of the cell together and controls what passes into and out of the cell.

Cells to SystemsPlant Cells Animal Cells

Cells to Systems

• Questions– What do cell walls provide? – How are plants, animals, and other living things

different from nonliving things? – What might happen to a cell that continues to get

bigger and bigger? – What might happen to a cell that continues to get

bigger and bigger? – List five parts of all cells and their jobs.