skeletal system
This framework of 206 bones supports the body protects internal organs and allows for movement.
what is the skeleton
Acting as the main control center for the entire body this organ is protected by the skull.
what is the brain
This muscular fist sized organ pumps blood continuously throughout the body.
what is the heart
The skeletal system protects this critical highway of nerves that runs down your back.
what is the spinal cord
These 12 pairs of curved bones protect your heart and lungs.
what are the ribs
Found in the thigh this is the longest heaviest and strongest bone in the human body.
what is the femur
These specialized messenger cells send and receive electrical signals throughout the body.
what are neurons
The human heart is divided into this many distinct hollow chambers.
what is four
The brain relies on the circulatory system to constantly deliver nutrients and this essential gas to survive.
what is oxygen
This is the scientific name given to both your finger bones and your toe bones.
what are phalanges
This flexible rubbery tissue cushions the ends of bones at joints to prevent them from rubbing together.
what is cartilage
Together the brain and the spinal cord make up this major subsystem abbreviated as the CNS.
what is the Centeral Nervous System
These thick walled blood vessels always carry oxygen rich blood away from the heart to the rest of the body.
what are arteries
Bones cannot move on their own they must be pulled by muscles via instructions sent from this system.
what is the nervous system
These one way entryways inside the heart and veins prevent blood from flowing backward.
what are valves
These tough fibrous bands of connective tissue attach bones directly to other bones.
what is ligaments
Located at the back of the brain this structure controls balance posture and complex muscle coordination.
what is the cerebellum
This specific protein inside red blood cells binds to oxygen and gives blood its bright red color.
what are capillareies
The bones of the rib cage expand and contract to help the lungs breathe while protecting this major circulatory organ.
what is the heart
This is the rapid, automatic, and involuntary response to a stimulus like pulling your hand away from a hot stove.
what is a reflex
This is the flexible spongy material found inside the center of bones where new blood cells are produced
what is bone marrow
This branch of the nervous system controls automatic involuntary bodily functions like digestion and heart rate.
what is the autonomic nervous system
This specific protein inside red blood cells binds to oxygen and gives blood its bright red color.
what is hemoglobin
The skeletal system produces red blood cells, which are then distributed to the body by this system.
what is the circulatory system
This type of joint found in your shoulders and hips allows for the widest range of circular movement.
what is the ball and socket joint