levels of organization in an organism

1. From Cells to
Organisms
Organisation of Life

2. 1. Define: Cell, Tissue, organ, and organ
system (DK).
2. Describe two types of tissue (DK)
3. Describe two types of organs (DK)
4. Create a flow chart illustrating relationship
between cells, tissues, organs, systems and
organisms (PK)
Lesson Objectives

3. Levels of Organization
 Cell—Basic unit of structure and function in
organisms.
 Some organisms, like bacteria and protists, are
unicellular (made entirely of one cell).
 Some organisms, like fungi, plants, and animals,
are multicellular (made of many cells).
 In multicellular organisms, cells exhibit cell
specialisation. They take on specific jobs and look
different from each other.
 The cells also exhibit division of labor. They split
up the work of the organism.

5. Levels of Organization
 Tissues—Groups of similar cells that work
together to perform a specific function.
 4 major tissue types in animals
 Epithelial tissue
 Connective tissue
 Muscle tissue
 Nervous tissue

6. Levels of Organization
 Organs—structures made of different types of
tissues that work together to perform a specific
function.
 Examples
 Heart
 Lungs
 Stomach
 Small intestine
 Liver
 Large Intestine
 Gall Bladder
 Plant Roots
 Plant Stems
 Plant Leaves

7. Levels of Organization
 Organ Systems—Groups of organs that work
together to perform a specific function.
 Examples:
 Digestive system
 Circulatory system
 Respiratory system
 Nervous system
 Muscular system
 Skeletal system
 Integumentary system (skin)
 Vascular system in plants

8. Levels of Organization
 Organism—A complete, individual living thing.
 Examples:
 A single person
 A single plant
 A single bacterium
 A single protist

10. Write your answers in complete sentences
Q 1: A (tissue, organ, system) is a group of the same kinds of cells that work together.
Choose the right answer.
system
organ
tissue
Q 2: Some tissues and organs work together like the members of the team. The parts
that work together are called a _____________.
cell
system
group
Q 3: The mouth, teeth, tongue, stomach and intestines all work together. Therefore
they are called the important parts of __________________.
digestive system
circulatory system
muscular system
Q 4: Brain, heart and lungs are some of the important _______________ in a body.
organs
tissues
cells
system
Q 5: Different tissues work together to form _________ .
cells
system
organs
Q 6: Different systems work together to form organs. True or false?
false
true

11. 11
Organization of Vertebrate Body
Tissues are groups of cells that are
similar in structure and function
In humans, there are four primary
tissues:
-Epithelial, connective, muscle and
nerve

12. 12
Organization of Vertebrate Body
Organs are combinations of different tissues
that form a structural and functional unit
Organ systems are groups of organs that
cooperate to perform the major activities of
the body
-The human body contains 11 principal organ
systems

13. Organ Systems
 The five main organ systems that we will be
focusing on in this unit are:
 The Respiratory System
 The Circulatory System
 The Reproductive System
 The Digestive System
 The Excretory System

14. 14
Organization of Human Body
NO Thank you!

15. 15
Digestive System
NO Thank
you!
The organs or parts of the
body that work together to
break down food into a
smaller, more useable form.

16. 16
Circulatory System
NO Thank
you!
The system that carries
oxygen and nutrients to all
cells in the body and takes
wastes away from the cells;
it consists of the heart,
blood vessels and blood.

17. 17
Respiratory System
NO
Thank you!
The system involved in the
inhalation of and diffusion
of oxygen into the blood
stream, and the removal of
carbon dioxide from the
body via exhalation

18. Excretory System
The system
responsible for
the removal of
excess water
and waste from
cell reactions in
the body

19. Reproductive System
The male and female reproductive systems are responsible
for the production of sperm and ova (eggs), the fertilisation of
ova by sperm, and the gestation of a fertilised ova into a
foetus (unborn baby)