Living Things
What is a cell?
A. The smallest unit of life that can carry out life processes
B. A group of organs
C. A type of disease
D. A body system
A. The smallest unit of life that can carry out life processes
What is a body system?
A. A single cell that performs an important job
B. A group of organs that work together to perform specific functions
C. A group of microorganisms
D. A type of tissue
B. A group of organs that work together to perform specific functions
Which organs filter waste from the blood and help produce urine?
A. Lungs
B. Kidneys
C. Stomach
D. Heart
B. Kidneys
What is a tissue?
A. A group of similar cells working together to perform a specific function
B. A single microorganism
C. A complete body system
D. A group of unrelated organs
A. A group of similar cells working together to perform a specific function
Which organs are most directly involved in breathing?
A. Heart and blood vessels
B. Lungs and airways
C. Stomach and intestines
D. Kidneys and bladder
B. Lungs and airways
Why are cells important to living things?
A. All living things are made of one or more cells.
B. Cells are only found in humans.
C. Cells are nonliving structures.
D. Cells only exist inside organs.
A. All living things are made of one or more cells.
What is the primary function of the respiratory system?
A. To digest food
B. To transport blood
C. To exchange oxygen and carbon dioxide
D. To remove solid waste
C. To exchange oxygen and carbon dioxide
What is the muscular system primarily responsible for?
A. Moving the body
B. Filtering blood
C. Absorbing nutrients
D. Exchanging gases
A. Moving the body
Which statement correctly shows how cells are organized in a multicellular organism?
A. Cells → tissues → organs → organ systems
B. Organs → tissues → cells → organ systems
C. Tissues → cells → organ systems → organs
D. Organ systems → cells → tissues → organs
A. Cells → tissues → organs → organ systems
Which organ pumps blood throughout the body?
A. Lung
B. Kidney
C. Heart
D. Stomach
C.Heart
An organism made of only one cell is called:
A. Multicellular
B. Unicellular
C. Microscopic
D. Pathogenic
B. Unicellular
What is the main function of the circulatory system?
A. To break down food
B. To transport materials throughout the body
C. To control breathing
D. To move the skeleton
B. To transport materials throughout the body
What is one major function of the excretory system?
A. Removing waste products from the body
B. Moving bones
C. Taking in oxygen
D. Breaking down food
A. Removing waste products from the body
A student says, "My body is made of millions of cells, but those cells don't really work together." Which response is most accurate?
A. Correct, because cells work completely independently.
B. Correct, because only organs work together.
C. Incorrect, because cells are organized into tissues, organs, and organ systems that work together to keep the body functioning.
D. Incorrect, because humans are actually unicellular organisms.
C. Incorrect, because cells are organized into tissues, organs, and organ systems that work together to keep the body functioning.
You eat a sandwich before playing soccer. Which system breaks the sandwich down so nutrients can be absorbed?
A. Digestive system
B. Respiratory system
C. Nervous system
D. Muscular system
A. Digestive system
What is a microorganism?
A. An organism that is generally too small to be seen without magnification
B. An organism that is always harmful
C. A group of body systems
D. A nonliving object
A. An organism that is generally too small to be seen without magnification
Where does most nutrient absorption occur?
A. Small intestine
B. Heart
C. Lungs
D. Kidneys
A. Small intestine
Which body system sends signals that help control and coordinate the body's activities?
A. Digestive system
B. Nervous system
C. Circulatory system
D. Excretory system
B. Nervous system
What is a pathogen?
A. A microorganism or infectious agent that can cause disease
B. A type of body system
C. A healthy human cell
D. A blood vessel
A. A microorganism or infectious agent that can cause disease
A student is running around the track. Her breathing becomes faster and her heart beats faster. Why do these changes happen?
A. Her cells need more oxygen and nutrients.
B. Her digestive system has stopped working.
C. Her bones are producing oxygen.
D. Her muscles no longer need energy.
A. Her cells need more oxygen and nutrients.
Which sequence best describes how oxygen gets from the environment to body cells?
A. Lungs → blood → body cells
B. Stomach → lungs → blood
C. Kidneys → heart → lungs
D. Muscles → stomach → lungs
A. Lungs → blood → body cells
What is the main function of the digestive system?
A. To exchange gases
B. To break down food and absorb nutrients
C. To pump blood
D. To control body movement
B. To break down food and absorb nutrients
Which two systems work together to bring oxygen into the body and transport it to cells?
A. Digestive and nervous
B. Respiratory and circulatory
C. Muscular and digestive
D. Excretory and nervous
B. Respiratory and circulatory
Are all microorganisms harmful to humans?
A. Yes, all microorganisms cause disease.
B. No, many microorganisms are harmless or beneficial.
C. Yes, microorganisms always make people sick.
D. Only microorganisms found in food are harmful.
B. No, many microorganisms are harmless or beneficial.
What do red blood cells help transport?
A. Oxygen
B. Food only
C. Bones
D. Hormones only
A. Oxygen