chapter 6 skeletal system test
The cranial sutures begin to form at about what age?
5
The total number of phalangeal bones in the body is ________.
56
Humans have __________ cervical vertebrae and giraffes have __________.
7;7
How many carpal bones are in the wrist?
8
Which of the following statements about the paranasal sinuses is true?
They connect to the nasal cavities. They are lined with a ciliated epithelium. They make the skull bones lighter.
Which fontanelle of the infant skull is often referred to as the "soft spot" on newborns
anterior
The first cervical vertebra is called the _________.
atlas
Which of following is a function of the skeletal system?
body support protection of internal organs calcium homeostasis blood cell production
Which of the following hormones is currently thought to decrease plasma calcium levels in pregnant women and children?
calcitonin
PTH promotes the formation of which hormone?
calcitriol
Which hormone works directly in the intestine to increase plasma calcium levels?
calcitriol
When a fractured bone heals it leaves a thickened region known as a ________
callus
Endochondral bone development begins with the formation of a(n) __________.
cartilage model
Which spinal curve develops as the infant learns balance?
cervical
Which bone gives a crime scene investigator the best information on the gender of skeletal remains?
coxal bone
What structure is necessary for a bone to grow in length?
epiphyseal line
Where does growth in length occur?
epiphyseal line
Which of the following is formed immediately after a fracture?
hematoma
Which of the following would NOT be a way that parathyroid hormone (PTH) could alter plasma calcium levels? (Which one of the following is FALSE?)
increase osteoblasts on bone
A vertebra is an example of a(n) __________ bone.
irregular
Which of these is a primary role of the skeletal system?
leverage muscle attachment site calcium homeostasis
The bones that form the sole of the foot are the __________.
metatarsals
Osteoblasts are squamous cells that develop into ___________.
osteocytes
In relationship to the diaphysis of a long bone, the osteons are
parallel
Which hormone increases blood calcium upon secretion
parathyroid hormone (PTH)
The axial skeleton provides an extensive surface area for the attachment of muscles that __________.
position the appendicular skeleton perform respiration move the head
Which of these factors does not contribute significantly to normal bone formation?
potassium intake
The two spinal curves present at birth are called __________ curves.
primary
Migration of blood vessels into the central region of the cartilage bone model, starting bone development, occurs at which site?
primary ossification center
Which of these is characteristic of the female pelvis?
pubic arch greater than 100 degrees
Spongy bone is filled with ____________.
red bone marrow
Parathyroid hormone causes what response in the kidneys
retention of calcium ions
Where in the body does the production of precursors for the synthesis of calcitriol occur?
skin
How would removing hydroxyapatite from bone matrix affect the physical properties of a bone?
the bones would be more flexible
osteoblasts are more active than osteoclasts, bones may become __________
thicker, stronger, denser
Spongy bone comprises an open meshwork of osseous spicules called __________.
trabeculae
