Bone Tissue lecture 2 Flashcards
For women, the drop in estrogen as part of aging has what effect on bone tissue?
Demineralization
A decreased number of osteoblasts
A decrease in protein synthesis
A decreased number of osteoprogenitor cells A decreased number of osteoclasts
Demineralization
Which of the following is not a function of the skeleton?
Storage of calcium and phosphate ions Storage of red blood cells
Protecting the spinal cord
Protecting the brain
Providing leverage for muscles
Storage of red blood cells
How would increasing the amount of osteoid in the bony matrix affect the physical characteristics of bone? The bones would be stronger The bones would be larger The bone would be less flexible The bones would be less compressible The bones would be more brittle
The bones would be stronger
Which of the following are characteristics of the inorganic extracellular matrix. Contains hydroxyapatite Provides flexibility Lots of collagen fibers Contains calcium carbonate Provides hardness Includes glycoproteins
Contains hydroxyapatite
Contains calcium carbonate
Provides hardness
If the __________ component of bone is not in adequate amounts, the flexibility and strength of bone will be compromised.
collagen
The marrow cavity of the long bones are lined with
endosteum.
Cells depositing bone matrix are
osteoblasts.
Stem cells
Differentiate into osteoblasts
Osteogenic cells
Bone building cells
Increased activity results in increased bone density
Osteoblasts
Massive, multinucleated cells
Osteolysis
Osteoclasts
Bone cells encased in matrix
Trapped in lacuane
Osteocytes
Osteogenic cells are bone stem cells that differentiate into osteoblasts and osteoclasts
True
False
False
Osteons in what type of bone tissue?
Compact bone
Cortical bone is what type of bone tissue?
Compact bone
what type of bone tissue is Found in the diaphysis of long bones?
Compact bone
Central canals are found in what type of bone tissue?
Compact bone
what type of bone tissue is Found in the superficial regions of all bones?
Compact bone
Trabeculae is found in what type of bone tissue?
Spongy bone
Diploe is found in what type of bone tissue?
Spongy bone
what type of bone tissue is Found in the epiphyses of long bones?
Spongy bone
Growth in length of an immature long bone occurs at the
epiphyseal plate.
Intramembranous ossification produces the
flat bones of the skull.
Which of the following structures or bones are associated with endochondral ossification? Diaphysis Epiphyseal plates Primary and secondary marrow cavities Diploe Bony collar Femur Parietal bones of the skull Hyaline cartilage
Diaphysis Epiphyseal plates Primary and secondary marrow cavities Bony collar Femur Hyaline cartilage
In the epiphyseal plate, chondrocytes swell and die in which layer?
Zone of hypertrophy
Patches of fibrocartilage formed in the healing of a fracture are called __________, whereas the bony collar formed around the fracture is called __________.
soft callus; hard callus
In adults, red bone marrow can be found in the diaphysis. medullary cavity of long bones. head of the femur. compact bone.
head of the femur.
The gradual loss of bone matrix in elderly patients is
osteoporosis.
The bone disease that involves excessive proliferation of osteoclasts; leading to rapid, disorderly bone bone remodeling and weak, deformed bones.
Paget’s disease
Which of the following is not a function of parathyroid hormone (PTH)?
Lowers blood calcium
Inhibits osteoblast activity
Stimulates osteoclast activity
Promotes calcium reabsorption by the kidneys
Lowers blood calcium
Bone protrudes through the skin in a fracture called
open.
A break in a bone that is already weakened by some other disease is called a(n) __________ fracture.
pathological
A fracture where the broken ends of the bones are fragmented is called a _______ fracture.
comminuted
If a thyroid tumor secreted an excessive amount of calcitonin, we would expect
a rise in blood calcium concentrations.
an elevated level of osteoclast activity.
brittle bones.
an elevated level of osteoblast activity.
a reduced rate of endochondral ossification
an elevated level of osteoblast activity.
