Bone Tissue lecture Flashcards
During fracture repair, which of the following is the second step? Formation of a fracture hematoma Soft callus formation Bone remodeling Hard callus formation Spongy bone is laid down
Soft callus formation
During the healing of a bone fracture, a hard callus is formed by
osteoblasts.
Which of the following is the correct sequence of events in the healing of a bone fracture?
Hematoma formation → soft callus formation → hard callus formation → bone remodeling
The medullary cavity in a long bone contains
yellow marrow.
The red marrow is also known as myeloid tissue.
True
False
True
The tissue found in the medullary cavity that is primarily adipose tissue is
yellow marrow.
The substance filling spaces in spongy bone is
red marrow.
The fibrous membrane covering bones is the
periosteum.
If the __________ component of bone is not in adequate amounts, the flexibility and strength of bone will be compromised.
collagen
The skeletal system helps maintain acid-base balance by __________.
absorbing or releasing alkaline phosphate and carbonate salts.
Which vitamin is necessary for collagen formation?
Vitamin C
Most blood cells are produced in the red marrow of bones.
True
False
True
Osteoid refers to
collagen fibers and glycoproteins.
Which of the following are characteristics of the osteoid. Contains calcium carbonate Lots of collagen fibers Includes glycoproteins Contains hydroxyapatite Provides flexibility Provides hardness
Lots of collagen fibers
Includes glycoproteins
Provides flexibility
The expanded head at each end of a long bone is called the
epiphysis.
What would you find in the marrow cavity of the diaphysis of an adult humerus (arm bone)?
Yellow marrow
The type of bone responsible for blood cell formation and energy storage is
spongy bone.
The area of bone responsible for blood cell formation is
spongy bone.
If a thyroid tumor secreted an excessive amount of calcitonin, we would expect
an elevated level of osteoblast activity.
Premature closure of the epiphyseal plates could be caused by
elevated levels of sex hormones.
Jack develops a benign tumor of the thyroid gland which cause the level of calcitonin in his blood to be higher than normal. Which of the following would you expect to occur as a result of this condition?
Decrease in blood levels of calcium
During appositional growth
bones grow wider.
In endochondral ossification, the _______ connective tissue is replaced by bone.
hyaline cartilage
Which of the following is formed by intramembranous ossification? Phalanges of fingers Tibia bone of the lower leg Temporal bone of skull Femur Radius of lower arm
Temporal bone of skull
Secondary ossification centers occur
in the center of the epiphyses.
Which of the following is formed by intramembranous ossification? Carpal bones Clavicle Femur Phalanges
Clavicle
A radiograph (X-ray) of a child’s hand will show epiphyseal lines.
True
False
False
Intramembranous ossification begins with _____ cells.
mesenchymal
Cells depositing bone matrix are
osteoblasts.
Bone-forming cells are called
osteoblasts.
Large multinucleated cells that can dissolve the bony matrix are called
Osteoclasts
Cells that remove bone matrix are
osteoclasts.
The bone disease caused by defective collagen deposition that renders the bones exceptionally brittle.
Osteogenesis imperfecta
Osteoporosis is most common in elderly women because of the lack of ___________, which would otherwise inhibit ____________.
estrogen; osteoclast activity
dietary calcium; estrogen production parathyroid hormone; osteocyte activity
estrogen; osteoclast activity
