Levels of Organization
Which is the smallest level of organization?
A. tissue
B. organ
C. cell
D. system
C. Cell
Which system controls body activities?
A. digestive
B. circulatory
C. nervous
D. skeletal
Which is a function of the skeletal system?
A. breathing
B. pumping blood
C. protecting organs
D. digesting food
C. Protecting organs
What do muscles help the body do?
A. think
B. move
C. digest
D. breathe
B. Move
What gas enters the body when breathing in?
A. nitrogen
B. carbon dioxide
C. oxygen
D. hydrogen
C. oxygen
Which organ pumps blood?
A. brain
B. heart
C. stomach
D. lungs
B. heart
What is the main job of the digestive system?
A. thinking
B. breathing
C. breaking down food
D. pumping blood
C. breaking down food
Which systems work together to move the body?
A. digestive and skeletal
B. muscular and skeletal
C. nervous and digestive
D. respiratory and circulatory
B. muscular and skeletal
Which is an example of a tissue?
A. heart
B. digestive system
C. muscle tissue
D. organism
C. Muscle Tissue
Which organs belong to the Nervous system?
A. lungs and trachea
B. stomach and intestines
C. brain and spinal cord
D. heart and veins
C. brain and spinal cord
Which structure is part of the skeletal system?
A. femur
B. lung
C. liver
D. heart
A. Femur
Muscles move when they:
A. expand only
B. produce blood
C. contract and relax
D. fill with air
C. contract and relax
Which organs are part of this system?
A. brain and nerves
B. lungs and trachea
C. heart and veins
D. stomach and liver
B. lungs and trachea
Which are types of blood vessels?
A. nerves
B. bones
C. intestines
D. arteries and veins
D. arteries and veins
Which organ is part of this system?
A. lung
B. skull
C. stomach
D. heart
Which systems work together to deliver oxygen?
A. digestive and nervous
B. skeletal and muscular
C. respiratory and circulatory
D. digestive and skeletal
C. respiratory and circulatory
Which shows the correct order from smallest to largest?
A. organ → cell → tissue → system
B. cell → tissue → organ → system → organism
C. system → organ → tissue → cell
D. tissue → cell → system → organism
B. cell → tissue → organ → system → organism
What travels through nerves to send messages?
A. nutrients
B. signals
C. oxygen
D. blood
B. signals
Where are red blood cells made?
A. lungs
B. stomach
C. heart
D. bone marrow
D. Bone Marrow
Which organ is mostly muscle?
A. lung
B. heart
C. brain
D. liver
B. heart
Where does gas exchange happen?
A. lungs
B. bones
C. stomach
D. heart
A. lungs
What does blood carry?
A. bones
B. oxygen and nutrients
C. muscles
D. air
B. oxygen and nutrients
Where does most nutrient absorption happen?
A. mouth
B. small intestine
C. liver
D. esophagus
B. small intestine
Which system controls all other systems?
A. circulatory
B. respiratory
C. nervous
D. digestive
C. nervous
This level is made when different tissues work together to perform a function.
This organ is the control center of the body.
The brain
This structure protects the brain.
The Skull
This system works with muscles to allow movement.
The skeletal system
This waste gas leaves the body when breathing out.
Carbon Dioxide
This liquid moves through blood vessels.
Blood
These substances from food give the body energy.
Nutrients
These two systems work together to provide nutrients to cells.
The digestive and circulatory systems
This level includes all organ systems working together.
An organism
These structures carry messages between the brain and body.
These hard structures give the body shape.
What are bones?
These structures are pulled by muscles to create movement.
Bones
This process is the exchange of oxygen and carbon dioxide.
Gas exchange
These tiny vessels allow materials to move between blood and cells.
Capillaries
This long tube connects the mouth to the stomach.
Esophagus
These two systems work together to allow the body to react quickly by sending signals that cause movement.
The nervous and muscular systems?