Page 23 - 新思维科学学生用书7 样章

1 Cells

Organs and organ systems
This is part of a leaf, cut open. A leaf is a plant organ,
and contains several di erent kinds of tissue.

The bodies of plants and
animals contain many upper epidermis
different parts, called

organs. For example, palisade layer
your organs include your
brain, heart and muscles.

Plants’ organs include spongy layer
leaves, roots and flowers.

Each organ is made lower epidermis
up of several different
kinds of tissue, working This is part of a leaf, cut open. A leaf is a plant organ, and contains several different

together. For example, kinds of tissue.
your brain contains neurones, and also several other kinds of cell. A plant root contains root hair cells,
and also several other kinds of cell.

Organs also work together. A set of organs that all work together to carry out the same function is
called an organ system.

Activity 1.4.1

Organs and systems in humans
Your task is to find out the names and functions of the different organs that are part of
one system in the human body.

Choose from: digestive system, circulatory system, respiratory system or skeletal
system.

When you have found this information, decide how to display it. Perhaps you could
make a presentation, or a large drawing with labels and descriptions.

Question
3 Copy and complete each sentence, using words from the list.

organism tissue organ organ system
A group of similar cells is called a .

An is a structure made of many different tissues.
An is a group of organs that carry out a particular function.
An is a living thing. It may contain many different organ systems, organs and
tissues.

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