chapter 6 quiz

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osteons

functional unit of compact bone

lacunae

gaps in bone matrix which contain osteocytes

The skeleton does all of the following EXCEPT:

initiate movement

Osteoporosis

is a condition in which bone deposition exceeds bone resorption.

All of the following are true of exercise and bone EXCEPT:

Adolescents should avoid weight-bearing exercises to prevent bone loss in their later years

Which of the following is true of bone scans?

Bone scans are the standard medical imaging technique for measuring bone density

Which of the following is true of bony callus formation?

Fibrocartilage is converted to spongy bone by osteoblasts

Which of the following is true of bone remodeling?

It requires the activity of both osteoblasts and osteoclasts

All of the following issues are found in bone EXCEPT:

Muscle Tissue

what is the relationship of nerves and bones?

Nerves follow the blood vessels that supply the bones.

What is the relationship between the skeletal system and the blood ?

Some bones house hemopoietic tissue that make blood cells

Which of the following is true of bone histology?

The connective tissue matrix of bone is only about 50% crystallized mineral salts

Compared to intramembranous ossification, endochondral ossification

allows both interstitial and appositional growth.

How does PTH elevate blood Ca2+ levels?

by increasing the number and activity of osteoblasts

Which blood vessels are associated with a hole in the shaft of a long bone?

diaphyseal arteries and veins

Which event must occur first in appositional growth of bone?

differentiation of periosteal cells into osteoblasts

Which of the following is the membrane that lines the medullary cavity of a long bone?

endosteum

Spongy bone

houses red bone marrow

All of the following are associated with compact bone EXCEPT:

trabeculae

When the bone matrix forms during intramembranous ossification,

trabeculae develop and fuse to form spongy bone.

The epiphyseal plate

consists of 4 zones of Chondrocytes

osteoprogenitor cells

derived from embryonic cells that persist in periosteum; become osteoblasts

osteoclasts

derived from white blood cells called monocytes; secrete enzymes that resorb bone

Place the events of intramembranous ossification in the order in which they occur.

development of the ossification center, calcification, formation of trabeculae, development of periosteum.

The alignment of osteons in compact bone

is along lines of physical stress on a long bone

Compact bone

is arranged in units called osteons (Haverstian system)

The zone of hypertrophic cartilage

is filled with large chondrocytes that are accumulating glycogen

Which of the following cells would be expected to be most active in replacing bone matrix lost due to an injury?

osteoblasts

Which of the following hormones is most important in regulating the movement of Ca2+ between the blood and bones?

parathyroid hormone

periosteum

protects bone; assists in fracture repair; essential for appositional growth

The pediatrician tells the parents that their child has a greenstick fracture. IN Laymen's terms, what is a greenstick fracture?

A partial break that results in one side of the broken bone bending

osteocytes

arise from cells that trap themselves in the calcified matrix they secrete; maintain daily metabolism of bone

Which structures allow communication between blood vessels and nerves in the periosteum and endosteum?

central (Haversian) canals

canaliculi

channels in bone matrix; allow osteocytes to communicate with each other

articular cartilage

reduces friction and absorbs shock at joints that have a wide range of motion

Bone formation

requires replacement of pre-existing connective tissue.

diaphysis

shaft of a long bone


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