Levels of Organization
Put these in order from smallest to largest: organ, cell, tissue, organism, organ system.
Cell → Tissue → Organ → Organ System → Organism
The main job of the respiratory system is to ________.
Hint: Be more specific than "to breathe."
Bring oxygen into the body and remove carbon dioxide.
The heart acts as what type of machine for the body?
A muscular pump
The main function of the digestive system is to ________.
Hint: Be more specific than "digest."
Break down food and absorb nutrients.
Which body system controls and coordinates the body's activities and responses?
Nervous System
Which two systems work together to supply oxygen to body cells?
Respiratory and Circulatory Systems
This level of organization is made of similar cells working together.
Tissue
What is the main job of the lungs?
Take in oxygen and expel carbon dioxide.
The circulatory system transports these two important materials to body cells.
Oxygen and nutrients
Which organ uses acid and churning to break down food?
Stomach
The brain and spinal cord together make up what?
Central Nervous System (CNS)
After nutrients are absorbed in the digestive system, which system transports them throughout the body?
Circulatory System
The heart is an example of this level of organization.
Organ
What is the main job of the alveoli?
Exchange oxygen and carbon dioxide between the lungs and bloodstream.
Which blood vessels carry blood away from the heart?
Arteries
Which organ absorbs most nutrients from food?
Small intestine
Which brain part controls voluntary movement, senses, and thinking?
Cerebrum
How do the respiratory and circulatory systems work together?
The respiratory system brings oxygen into the lungs, and the circulatory system transports it to body cells.
A group of organs works together to digest food. What level of organization is this?
Organ system
A person can breathe in air, but oxygen is not entering the bloodstream. Which structure is most likely not working correctly?
Alveoli
Explain the difference between arteries and veins.
Arteries carry blood away from the heart; veins carry blood back to the heart.
Compare the jobs of the small intestine and large intestine.
The small intestine absorbs most nutrients; the large intestine absorbs water.
A student sees a slice of pizza and suddenly feels hungry. Which body systems are working together?
Nervous and Digestive Systems
How do the digestive and circulatory systems work together after you eat?
The digestive system absorbs nutrients, and the circulatory system transports them to body cells.
A muscle cell, muscle tissue, the heart, the circulatory system, and a human represent the five levels of organization. Put them in order from smallest to largest.
Muscle Cell → Muscle Tissue → Heart → Circulatory System → Human
A person's diaphragm stops working correctly. Explain how this would affect breathing and oxygen intake.
The lungs would have difficulty expanding and contracting, so less oxygen would enter the body.
A person's capillaries are damaged. Which important function would be affected most?
Delivering oxygen and nutrients to body tissues.
A person's pancreas is not producing enough enzymes. What would most likely happen during digestion?
Food would not be broken down completely, so fewer nutrients would be absorbed.
You touch a hot stove and pull your hand away. Explain how the nerves, spinal cord, and brain work together to make this happen.
Nerves detect the heat and send a signal through the spinal cord.
The spinal cord helps trigger a quick response, and the brain processes the information so the person recognizes the danger.
Choose two body systems and explain:
-The main job of each system
-How they work together to help the body survive
Example: The respiratory system brings oxygen into the body. The circulatory system transports oxygen to cells. Together they help cells make energy.