System
a group of things that affect each other and function as a whole
Example: the nervous system and the skeletal system
Function
what something does
Example: the function of muscle is to move bones
Structure
the specific form and shape of something
Example: the skeleton is a structure in a human body
Dissect
to take something apart to study it
Model
a pretend version of something that scientists use when the real thing is too big, small, or complicated to work with
Muscle
a part of the body that attaches to bones and allows the body to move
Joint
a part of the body where two bones come together and can bend
Bicep
a large muscle in the upper arm
Tendon
a part of the body that attaches muscle to bone
Skeleton
all of the bones of an animal, including humans
Bones
the hard parts inside many animals that help give their bodies shape
Pupil
the dark opening in the center of the eye
Iris
the colored part of the eye that is shaped like a donut
Cornea
the clear layer in front of the eye
Retina
the back of the eye that senses light and sends messages to the brain
Lens
a clear object that changes the direction of light as it passes through
Nocturnal
active mostly at night
Brain
a part of the body that receives, processes, and responds to signals from the nerves
Nerves
The parts of the body that carry signals from one part of the body to another
Nervous System
the brain and all the nerves in the body