Introduction to the Skeletal System

An adult human has how many bones?

Any bone is considered

• a system

• a cell

• an organ

• an organism

The functions of the skeletal system include: providing a ​ (a)   to support muscles, fat, and skin; providing ​ (b)   by surrounding organs; providing ​ (c)   for movement; providing ​ (d)   for the body's minerals; and ​ (e)   .

• framework
• protection
• levers
• storage
• blood cell formation

There are two classifications of bone tissue: ​ (a)   bone which is spongy, porous, and made of trabeculae; and compact or ​ (b)   bone which is the harder, outer portion of bone made of osteons.

• cancellous
• cortical

Match the following types of bone cells.

• mature bone cells that are surrounded by the bone matrix

• Osteoclasts

• immature cells which build the bone matrix

• Osteoblasts

• breaks done the bone matrix to release minerals we need

• Osteocytes

Bones vary in size and shape depending on their location in the body.

• True

• False

Match the following types of bones with the correct description.

• typically cube-like in shape

• Sesamoid bones

• Complex shapes that may perform various functions

• Long bones

• bones that are entirely embedded in a tendon.

• Flat bones

• are typically bones that protect internal organs

• Irregular bones

• are longer than they are wide

• Short bones

Match the following types of bones with the correct examples.

• femur, humerus, ulna, radius, tibia, fibula

• Sesamoid bones

• carpals and tarsals

• Short bones

• vertebral bones, facial bones

• Long bones

• Frontal bone, parietal bone, occipital bone, sternum, ribs, ilium of the pelvis

• Flat bones

• patella

• Irregular bones