Bone Structure
What is the hard outer part of bone called?
Compact bone
How many bones are in an adult human body?
206 bones
Name 4 function of the skeleton.
support / protection / movement / making blood cells
What type of joint is the knee?
a hinge joint
What do muscles do to move bones?
pull
What is the lighter inner part called?
spongy bone
What is the name of the bone that protects the brain?
the skull
Which organs are protected by the ribs?
heart and lungs
What type of joint is the hip?
a ball-and-socket joint
What connects muscles to bones?
tendons
What fills the inside of long bones?
bone marrow
Why are some bones in a baby’s skull not fused at birth?
To allow the brain to grow and the skull to expand
What part of the skeleton protects the spinal cord?
vertebral column
Which joint allows movement in all directions?
a ball-and-socket joint
What are muscle pairs called that work opposite each other?
antagonistic muscles
What covers the ends of bones in joints to reduce friction?
cartilage
Name the longest bone in the human body.
the femur
What produces blood cells inside bones?
bone marrow
What type of joint is found in the skull?
a fused joint
Which muscle bends your arm?
the biceps
What fluid helps joints move smoothly?
synovial fluid
Compare the structure of long bones and explain how it helps movement and strength.
Long bones have compact bone on the outside for strength and spongy bone inside to reduce weight, making movement easier while staying strong
What nutrient is important for strong bones?
calcium (and vitamin D)
What is the main difference between hinge and ball-and-socket joints?
Hinge - back and forth; Ball-and-socket - all directions
What happens to the triceps when the biceps contracts?
it relaxes