This document describes how cells make up tissues, tissues make up organs, and organs work together in organ systems to form living organisms. It provides the example of how the thigh bone is composed of different tissues like cartilage and tendons, which are themselves made up of cells. The document includes an activity where students investigate chicken wings to identify different tissues and organs. It also discusses how Antonie van Leeuwenhoek first observed single-celled microorganisms using early microscopes.

1. CELLS AS THE BUILDING BLOCKS FOR LIFE
LOWER SECONDARY SCIENCE GRADE 6

2. LESSON OBJECTIVES
At the end of the lesson you should be able to:
 Describe how organs are made up of tissue
 Describe how tissues are made up of cells
 Describe organisms in terms of cells, tissues, organs and
organ systems

3. REVISION FROM PREVIOUS LESSON
the smallest unit
with the basic
properties of life.
a group of similar
cells that work
together to perform
a function.
a structure composed
of a group of different
tissues that work
together to perform a
specific function
group of organs and body
parts that work together to
accomplish a common goal.
a living thing that
has an organized
structure

4. STARTING POINT
 Animals contains many different organs, which work together in an
organ system, even in plants and in human.
 This organs are made out of tissue that came from a group of cells
of the same type performing the same task or function.

5. EXAMPLE: THE THIGH BONE
 Not all its part looks the same. This different areas are its
tissues. All organs are made out of different tissues.
 Tissues are made out of smaller parts called cells. Cells are
the smallest living parts of organisms, and all the cells in
the tissue are the same.
 In large organisms such as plant and animal (multicellular
organisms):
 A group of cells of the same type forms a tissue
 A group of tissue working together creates and organ
 A group of organs working together forms an organ system

6. ACTIVITY: INVESTIGATING CHICKEN WINGS
 Can you identify different tissue and organ in the chicken wing?
 Have a look/ watch the video of a chicken wing being dissected (https://youtu.be/CYxfKPAV4-k ) Take
down notes.
 Have you seen 2 different organs? what are they?
 Tendons
 Cartilage
 Write a short report to describe what you have found and include a drawing. Do not use morethan 200 words. 100
is just enough.

7. DISCOVERING MICROORGANISMS
 Delft is a city in the Netherlands. In the 17th
century, Antonie van Leeuwenhoek owned a
fabric shop there. In order to check the treads
on his fabrics, he made tiny magnifying glasses,
which are very powerful. Using one of this, he
was the first person to see organisms that are
too small to observe in our eyes alone. Today
we know that this “microorganisms” are made
out of only one cell.

8. QUESTIONS: USE YOUR NOTEBOOK
1.
 Why is cartilage tissue important at the ends of some bones?
 What is cartilage tissue made of?
 Explain why bone is an organ?
 What organ system do bones belong to?
2. Muscles contains many muscle cells.
 suggest the names of the tissue that these cells form.
 muscles also contains connective tissue, which is tough and strong. What part of the mucle do you
think contains a lot of this tissue?
3. Suggest why scientist often think of blood as being a liquid organ.