something a person does without thinking about it

a place where bones join together

the way the body is held while sitting, standing, or moving around

the bones which protect the heart and lungs

the framework for the body

hairlike structures along the surface of the mucous membrane that filter the air you breathe (located in the air passages)

the moist lining inside the openings to the body

the process by which air enters and leaves the body

what waste gas does the body exhale?

the SUNSHINE VITAMIN

smoking can cause ?

exchanging oxygen and carbon dioxide between the air and the blood is the major purpose of the ?

the millions of tiny air sacs that are in the lungs and expand like tiny balloons

the two branches at the lower end of the trachea

a flat sheet of skeletal muscle which separates the chest cavity from the abdominal cavity

the voice box

loacated at the back of the nasal passage

a tiny flap of cartilage that covers the entrance to the trachea

also called the windpipe

also known as the voicebox

how many muscles are in the human body?

a hollow cavity in the front of the skull

the fibers which connect skeletal muscles to bones

muscles are made mostly of ?

when muscles gently pull against each other

the heart muscle is also known as this muscle ?

a type of exercise which strengthens the lungs and heart

shoulders and hips are these type of joints

Knees, elbows, and fingers have these joints

the thirty-three vertebrae make up this

shoulder muscle

top of upper arm muscle

front of upper leg muscle

forehead muscle

cheek to chin muscle

bottom of upper arm muscle