Cells are the tiny building blocks of living things.
Each cell has a cell membrane; a thin covering around the cell.
The cell membrane separates the inside parts of the cell from the outside
environment, gives the cell its shape, and controls what goes into and out
of it. Located inside a cell is the
cytoplasm. Cytoplasm is a jellylike liquid. Inside the
cytoplasm is the cell's control center called the nucleus. The
nucleus contains all of the instructions for running the cell. The
nucleus is surrounded by the nuclear membrane. The nuclear membrane
controls what goes into and comes out of the nucleus.
A cell is able to reproduce by means of splitting.
One cell splits into two cells. However before the cell splits, the
nucleus doubles and divides in half so each new cell has a copy of the
Look carefully at the diagram of the cell below.
Notice inside the cytoplasm are vacuoles and mitochondria. Vacuoles are tiny oval
structures that store food, water, or wastes. Mitochondria are shaped like kidney
beans. Mitochondria are important parts of a cell because they help
change food into energy. The cell uses the energy to do its work.
Cells do not all look the same. Their shape
depends upon the jobs they perform. Red blood cells are tiny and
round. They need to be so they can squeeze through blood vessels and
bring oxygen to the other cells in the body. Muscle cells are thin
and long. This is so they can expand and contract to help the body
All cells, whether plant or animal have these same
parts: cell membrane, cytoplasm, nucleus, nuclear membrane, vacuoles, and
mitochondria. Plant cells however have two additional parts that
animal cells do not. Plant cells have cell walls. This sturdy
layer around the cell membrane supports and protects the cell. Plant
cells also contain chloroplasts. Chloroplasts contain the green
substance called chlorophyll. Chlorophyll traps energy from sunlight and
enables a plant to make its own food.
Directions: Answer the questions about cells and
Located inside each cell is a jellylike liquid called
The control center of a cell is the
The thin covering around a cell is called the cell
Cells reproduce by which method?
Vacuoles are tiny
shaped structures that store food, water, or wastes.
Mitochondria, the kidney bean shaped part of a cell, are important because they help
change food into
cells are a tiny, round shape.
are a thin and long.
have two additional parts that
animal cells do not.
Cell walls, the sturdy
layer around the cell
supports and protects the plant cell.
cells contain chloroplasts which contain the green
Elementary & Middle School Lessons & Self-Correcting Tests for Children in all Subject Areas. If you have found an error or would like to make comments on this lesson,
please email us at:
Copyright 1999-2020 by Educational Designers, LLC. All rights reserved. Lessons & Tests in Math, Reading, Spelling, Science, Language, and Social Studies.
traffic. Your IP address and user-agent are shared with Google along with
performance and security metrics to ensure quality of service, generate
usage statistics, and to detect and address abuse."