Unit 1, Lessons 5 and 6 Test Prep

Front

Blood vessels that carry blood back to the heart

Back

veins

Front

A structure that contracts and relaxes to produce movement

Back

muscle

Front

a flattened, stiff plate that forms an outer covering on a fish or reptile

Back

scale

Front

a type of skeleton on the outside of some animals' bodies

Back

exoskeleton

Front

all of the bones or other structures that provide support to an animal's body

Back

skeleton

Front

the liquid part of blood

Back

plasma

Front

a place where two or more bones come together

Back

joint

Front

The process that breaks down food into smaller substances that the body can use.

Back

digestion

Front

blood vessels away from the heart

Back

arteries

Front

a lightweight, flat structure that forms an outside covering of a bird's body

Back

feather