Hair and nails are made of the protein:
A. Collagen
B. Keratin
C. Calcium
D. Melanin
B. Keratin
Muscles provide the force to _____ your body.
A. Protect
B. Move
C. Feed
D. Repair
B. Move
The circulatory system carries oxygen and _____ to cells.
A. Nutrients
B. Hormones
C. Water
D. Waste
A. Nutrients
The respiratory system _____ oxygen to the body.
A. Stores
B. Removes
C. Supplies
D. Produces
C. Supplies
The fertilized egg is called a:
A. Embryo
B. Fetus
C. Zygote
D. Placenta
C. Zygote
The endocrine system is a collection of:
A. Bones
B. Muscles
C. Glands
D. Nerves
C. Glands
The digestive system breaks down food into molecules the body can use as:
A. Waste
B. Energy
C. Water
D. Oxygen
B. Energy
Bone is a type of connective:
A. Organ
B. Tissue
C. Cell
D. Muscle
B. Tissue
Another name for the immune system is the:
A. Endocrine system
B. Nervous system
C. Lymphatic system
D. Digestive system
C. Lymphatic system
The kidneys _____ blood of waste.
A. Pump
B. Warm
C. Filter
D. Produce
C. Filter
Sexual reproduction increases genetic:
A. Strength
B. Diversity
C. Mutation
D. Stability
B. Diversity
The nervous system is made up of the brain, spinal cord, and:
A. Muscles
B. Bones
C. Nerves
D. Glands
C. Nerves
Skin is the largest _____ of the body.
A. Tissue
B. Cell
C. Organ
D. Bone
C. Organ
Cardiac muscle is found only in the:
A. Lungs
B. Brain
C. Heart
D. Stomach
C. Heart
The heart contains _____ chambers.
A. Two
B. Three
C. Four
D. Five
C. Four
The larynx is also called the:
A. Windpipe
B. Voice box
C. Air sac
D. Bronchiole
B. Voice box
Ovulation occurs when a _____ egg is released from the ovary.
A. Fertilized
B. Mature
C. Growing
D. Tiny
B. Mature
Hormones are the body's chemical:
A. Nutrients
B. Reactions
C. Defenses
D. Messengers
D. Messengers
Chemical digestion uses
A. Stomach acid
B. Bile
C. Enzymes
D. All of these
D. All of these
Bones help _____ your internal organs.
A. Feed
B. Repair
C. Protect
D. Warm
C. Protect
Lymph contains water, glucose, and _____ blood cells.
A. Red
B. White
C. Stem
D. Platelet
B. White
Ureters are _____ that carry urine from the kidneys.
A. Muscles
B. Tubes
C. Glands
D. Valves
B. Tubes
When does the heart begin beating?
A. 1 month
B. 2 months
C. 3 months
D. 4 months
A. 1 month
The _____ is the control center of the body.
A. Heart
B. Brain
C. Skull
D. Spine
B. Brain
Perspiration helps maintain body temperature by keeping the body:
A. Warm
B. Dry
C. Flexible
D. Cool
D. Cool
Skeletal muscles are connected to bones by:
A. Ligaments
B. Cartilage
C. Tendons
D. Joints
C. Tendons
Arteries carry blood _____ from the heart.
A. Toward
B. Away
C. Around
D. Into
B. Away
Alveoli are tiny:
A. Nerves
B. Blood vessels
C. Air sacs
D. Muscles
C. Air sacs
When do the lungs begin to develop?
A. 1 month
B. 2 months
C. 3 months
D. 4 months
C. 3 months
The pituitary gland is known as the:
A. Growth gland
B. Control gland
C. Master gland
D. Thyroid gland
C. Master gland
Small projections that increase surface area in the small intestine are called:
A. Nephrons
B. Alveoli
C. Villi
D. Nodes
C. Villi
Blood cells are formed in red:
A. Cartilage
B. Tendons
C. Ligaments
D. Marrow
D. Marrow
Pathogens are microorganisms that can:
A. Cause disease
B. Produce hormones
C. Carry oxygen
D. Build tissue
A. Cause disease
The urinary bladder _____ urine until released.
A. Filters
B. Produces
C. Removes
D. Stores
D. Stores
Ideally, the fetus is positioned _____ _____ for labor and delivery.
A. face up
B. feet first
C. head down
D. side lying
C. head down
A reflex is an _____ response.
A. Delayed
B. Learned
C. Voluntary
D. Automatic
D. Automatic
Bonus: Why does the human body have many different body systems instead of just one?
A. To make the body bigger
B. So different parts can do different jobs
C. To reduce the number of organs
D. To stop the body from working together
B. So different parts can do different jobs
Bonus: How do body systems work together?
A. They work separately with no connection
B. They take turns working
C. They depend on each other to keep the body working
D. Only one system works at a time
C. They depend on each other to keep the body working
Bonus: How do body systems help maintain homeostasis?
A. Each system works alone
B. Systems work together to keep the body balanced
C. Only the brain controls balance
D. The body does not need balance
B. Systems work together to keep the body balanced