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Name __________________________
Monday, 11-14-16
Packet # 2 - 9
7th Science - ________
AIM: Determine the correct order of the levels of organizations for
structure and function of living things, including cells, tissues, organs,
organ systems, organisms, and ecosystems.
Quote of the Day: “All great change in America begins at the dinner table.”
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President Ronald Reagan
Do Now
Read/annotate the text before answering the questions that follow:
Overview of body organization
All living organisms are made up of one or more cells. Unicellular organisms, like
amoebas, consist of only a single cell. Multicellular organisms, like people, are made up
of many cells. Cells are considered the basic units of life. The cells in complex
multicellular organisms like people are organized into tissues, groups of similar cells that
work together on a specific task. Organs are structures made up of two or more tissues
organized to carry out a particular function, and groups of organs with related functions
make up the different organ systems.
At each level of organization—cells, tissues, organs, and organ systems—structure is
closely related to function. For instance, the cells in the small intestine that absorb
nutrients look very different from the muscle cells needed for body movement. The
structure of the heart reflects its job of pumping blood throughout the body, while the
structure of the lungs has a clear focus on breathing in oxygen and breathing out carbon
dioxide.
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1. Tissues are groups of cells.
2. Organs are structures made up of tissues.
3. Groups of organs with related functions make up the different organ systems.
PPT – Take notes in spaces provided while discussing PowerPoint
Different body tissues and organs are made up of different kinds of cells.
The cells in similar tissues and organs in other animals are similar to those in human
beings but differ somewhat from cells found in plants.
Examples: brain cells, cardiac cells, skin cells, brain cells, muscle cells…
Groups of similar cells work to form a tissue, such as muscle tissue.
Different tissues are in turn grouped together to form larger functional units, called
organs.
Example: Heart, brain, lungs, etc.
Organs group together to form systems, such as the circulatory system, which pumps
blood through the heart.
The circulatory system is made up of organs - the heart, veins, arteries, etc.
All organ systems group together to form organisms.
Example: humans.
Ecosystem – a community of living organisms
All of the organisms in an area make up the ecosystem of that area
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Example: Amazon Rainforest in Brazil
Each type of cell, tissue, organ, organ system has a distinct structure and functions that
serve the organism as a whole.
Specialized cells perform specialized
functions in multi-cellular organisms
Video – be prepared to describe the
level of organization of the respiratory
system, from smallest unit to largest.
TERM BANK
Multicellular
Prokaryotic
Eukaryotic
Organ system
Organ
Cells
Tissue
Microscope
Paramecium
Energy
INDEPENDENT PRACTICE
PART 1: Fill-in-the-blank
1. A group of muscle cells working together to perform the same function form muscle
tissue.
2. Cells are the smallest part in all living things and they need energy to function and
survive.
3. A group of organs working together to perform a similar function create an organ
system.
4. A group of similar tissues working together form a(n) organ.
5. Cardiac (heart) tissue is made up of similar cardiac cells working together to perform
the same function.
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6. A prokaryotic cell is a cell with no nucleus that is always unicellular, which makes it
impossible to see without a microscope.
7. A(n) eukaryotic cell is a cell with a nucleus. It is usually multicellular, which means
you can see it with your eye.
8. A paramecium is a protist that moves with cilia and collects food with cilia into its
oral groove.
PART 2: Multiple-choice. Use MCS to solve the following problems.
9. A group of similar tissues working together to perform the same function is known as
a. Cells
b. Organ
c. Organ system
d. Organism
10. A group of blood cells working tougher to perform the same function make up
a. The heart
b. Blood tissue
c. The circulatory system
d. A human being
11. The digestive system, an organ system humans beings have, is made up of a group of
a. Cells
b. Tissue
c. Organs
d. Organisms
12. Which of the following is the correct order of the levels of organization of a human?
a. Cellstissueorganorgan systemorganism
b. Cellsorgantissueorgan systemorganism
c. tissuecells organism organ system organ
d. Cellsorganorgan systemtissueorganism
13. The heart, the lungs, and the brain are examples of
a. Cells
b. Tissues
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c. Organs
d. Organ systems
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