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Levels of Organization
Directions: Match the definition to the correct term
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CELL
TISSUE
ORGAN
ORGAN SYSTEM
a. a group of cells with a similar function
b. group of organs
c. a group of tissues that have a similar function
d. made up of organelles; basic
unit of life
Word Bank
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Nervous
Brain
Bacteria
Heart
Parasite
Carbon dioxide
Glands
Oxygen
Hormone
Pancreas
Excretory
Adrenaline
Pathogens
Directions: Fill in the blanks.
Endocrine System
1. The endocrine system is made
2. An example of a hormone is.
up
Antibodies
Immune
Protein
Mechanically
Sweat
Body Systems
of.
glands
is the fight or flight hormone.
Chemically
Engulf
Explode
Platelets
Gas Exchange
Antibiotics
Nutrients
Digestive
Virus
that make hormones
which lowers blood sugar. It is made in a gland
called the
3.
4. Hormone levels are controlled by.
mechanisms.
Nervous System
1. The
and nerves are part of the nervous system.
2. The nervous system and the.
system are called the control systems.
Circulatory System
1. The function of the circulatory system is.
2. The
is the major organ of the circulatory system. Its function is to
3. Red blood cells carry.
4.
White blood cells
clot the blood.
is released as waste.
espiratory System
1. The function of the respiratory system is.
2.
mune System
is breathed in while.
1. The job of the immune system is protect the body against.
2. Types of pathogens include
3.
and
Blood Cells are the main cells of the immune system.
6

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GinnyAnswer
Levels of Organization:

1. CELL - d. made up of organelles; basic unit of life
2. TISSUE - a. a group of cells with a similar function
3. ORGAN - c. a group of tissues that have a similar function
4. ORGAN SYSTEM - b. group of organs

Endocrine System:

1. The endocrine system is made up of glands.
2. An example of a hormone is adrenaline.
3. Hormone levels are controlled by feedback mechanisms.

Nervous System:

1. The brain and nerves are part of the nervous system.
2. The nervous system and the endocrine system are called the control systems.

Circulatory System:

1. The function of the circulatory system is to transport nutrients and oxygen throughout the body.
2. The heart is the major organ of the circulatory system. Its function is to pump blood.
3. Red blood cells carry oxygen.
4. White blood cells clot the blood, and carbon dioxide is released as waste.

Respiratory System:

1. The function of the respiratory system is gas exchange.
2. Oxygen is breathed in while carbon dioxide is exhaled as waste.

Immune System:

1. The job of the immune system is to protect the body against pathogens.
2. Types of pathogens include bacteria, viruses, and parasites.
3. Blood cells are the main cells of the immune system.

By understanding the different levels of organization in the body and the functions of various body systems like the endocrine, nervous, circulatory, respiratory, and immune systems, we can appreciate how each system works together to maintain overall health and well-being.

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