Skeletal System Part 1

Question 1

How many bones are in the body?

Answer 1

206 bones

Question 2

What are the 2 divisions of the skeleton?

Answer 2

Axial Skeleton & Appendicular Skeleton

Question 3

Axial Skeleton

Answer 3

Longitudinal axis of the body.
Protects internal organs.

Question 4

Appendicular Skeleton

Answer 4

The bones of the limbs and girdles that are attached to bones.
Facilitate movement.

Question 5

Joints

Answer 5

The place at which two bones meet to produce movement.

Question 6

Cartilage

Answer 6

Strong flexible connective tissue that protect bones and joints.

Question 7

Ligaments

Answer 7

Strong bands or straps of fibrous, collagen, tissue that provide support to bones and link bones to bones in and around joints.

Question 8

What are the functions of bones?

Answer 8

Support, Protection, Movement, Storage, & Blood Cell Formation

Question 9

Support (function)

Answer 9

Form the internal framework that supports the body and cradles the soft organs.

Question 10

Protection (function)

Answer 10

Protects the soft body organs.
Ex: Skull protects the brain

Question 11

Movement (function)

Answer 11

Skeletal muscles use bones as levers to walk, swim, throw a ball, and breathe.

Question 11

Storage (function)

Answer 11

Fat is stored in the internal cavity of the bone (also known as marrow)

Question 12

Blood Cell Formation (function)

Answer 12

Hematopoiesis occurs in the marrow cavities of certain bones.

Question 13

What are the two types of bone tissue?

Answer 13

Compact & Spongy

Question 14

Compact (bone tissue type)

Answer 14

Dense & appears smooth.
Riddled with passageways that carry nerves and blood vessels.
Mature bones cells are found in lacunae (tiny cavities).

Question 15

Spongy (bone tissue type)

Answer 15

Composed of smaller needlelike pieces of bone & lots of open space.
Provides balance to the dense & heavy compact bone by making bones lighter so that muscles can move them more easily.

Question 16

Haversian Canals

Answer 16

Carry blood vessels & nerves

Question 16

Lacunae

Answer 16

Tiny cavities.
Arranged in concentric circles calles lamellae.

Question 17

Canaliculi

Answer 17

Tiny canals that radiate outward from the central canals to all lacunae.

Question 18

What are the four classifications of bones?

Answer 18

Long, Short, Flat, & Irregular

Question 19

Long (bone)

Answer 19

Longer than they are wide.
Mostly compact tissue.
All bones of the limbs except patella, wrist, & ankle bones.
Yellow & Red Marrow.

Question 20

Short (bone)

Answer 20

Generally cube-shaped.
Spongy bone tissue.
Bones of the wrist & ankle.

Question 21

Flat (bone)

Answer 21

Thin, flattened, & curved.
Two thin layers of compact bone sandwiching a layer of spongy bone.
Skull, ribs, & sternum.

Question 22

Irregular (bone)

Answer 22

Bones that do not fit in any of the categories above.
Vertebrae & facial bone.