CH 6 Flashcards
which cells have a ruffled border and secrete hydrochloric acid?
osteoclasts
the medullary cavity of a child’s bone may contain..
red bone marrow
the long bones of the limbs grow in length by cell proliferation and hypertrophy in…
the metaphysis
osteoclasts are most closely related by common descent to
monocytes
the walls between cartilage lacunae break down in the zone of
bone deposition
what promotes bone deposition?
dietary calcium, vitamin D, calcitonin, and testosterone
a child jumps to the ground from the top of a playground “jungle gym”. His leg bones do not shatter mainly because they contain..
collagen fibers
one long bone meets another at its..
epiphysis
Calcitriol is made from
7-dehydrocholesterol
One sign of Osteoporosis is..
kyphosis
Calcium phosphate crystalizes in bone as a mineral called ___
hydroxyapatite
Osteocytes contact each other through channels called __, in the bone matrix
canaliculi
A bone increases in diameter only by ___ growth, the addition of new surface lamellae
appositional
Most compact bone is organized in cylindrical units called ___, composed of lamellae encircling a central canal
osteons
The ___ glands secrete a hormone that stimulates cells to resorb bone and return its minerals to the blood
parathyroid
The ends of a bone are covered with a layer of hyaline cartilage called the ___
articular cartilage
The cells that deposit new bone matrix are called ___
osteoblasts
the most common bone disease is ___
osteoporosis
The transitional region between epiphyseal cartilage and the primary marrow cavity of a young bone is called the ___
metaphysis
The cranial bones develop from a flat sheet of condensed messenchyme in a process called ___
intramembranous ossification
