Exam 2 Skeletal system part 3 Flashcards

1
Q

Development of the bones @ the top of the skull + clavicle are classified as what type of growth?

A

Intramembranous (dermal) bone growth

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2
Q

Development of the bones of the skull bas + all postcranial bones

A

Endochondral bone growth (cartilaginous)

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3
Q

Endochondral bone growth: ________ model forms (composed of hyaline cartilage)

A

Cartilaginous

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4
Q

Endochondral bone growth: Cartilage disintergrates excavates _____ of the bone; blood vessels invade, bringing undifferentiated _________ cells

A

Interior; Mesenchymal cells

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5
Q

Endochondral bone growth: Mesenchymal cells differentiate into _______, which start forming spongy bone

A

Ostroblasts

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6
Q

Endochondral bone growth: ________ forms; osteoblasts w/in the cellular layer of the _______ form compact bone.

A

Periosteum; periosteum

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7
Q

Endochondral bone growth: Further bone growth takes place in 2 directions:

A

B/t diaphysis & epiphysis (interstitial growth), Increase in over-all size (appositional growth)

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8
Q

Interstitial growth: Blood vessels invade ends of bone, which become _______ centers of ossification

A

secondary

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9
Q

Zone of cartilage remaining b/t primary & secondary ossification centers, site of active growth

A

Epiphyseal plate

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10
Q

Growth ceases when plate ______

A

ossifies

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11
Q

appositional growth: new compact bone deposited by osteoblasts just below the _______

A

periosteum

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12
Q

_____ @ inner bone surface destroy bony connective tissue & enlarge the ______ cavity (if present); remodel compact bone/spongy bone interface

A

Osteoclasts; medullary cavity

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13
Q

Intamembranous bone: Membranes form around _____ _____

A

Blood vessels

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14
Q

Intamembranous bone: Undifferentiated connective tissue cells around blood vessels differentiate into ______, which start forming ______ bone

A

Osteoblasts; spongy

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15
Q

Intamembranous bone: periosteum forms cells w/in the _____ layer differentiate into _______ which start forming compact bone below periosteum

A

cellular layer, osteoblasts

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16
Q

Intamembranous bone: Remaining growth takes place via mechanism similar to appositional growth of ________ bone

A

Endrochondral bone

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17
Q
  • Necessary for proper collagen formation

- Deficiency leads to scurvy

18
Q

Synthesized w/in the skin or ingested in the diet

19
Q

Vit. D facilitates proper bone mineralization by increasing absorption of calcium w/in the ________ & reabsorption of calcium in the _______

A

Small intestines; Kidneys

20
Q

Vit. D deficiency in children leads to?

21
Q

Vit. D deficiency in adults leads to?

A

Osteomalacia

22
Q

_______ hormone increases amount of calcium in blood by indirectly stimulating osteoclast activity

A

Parathyroid hormone (PTH)

23
Q

Parathyroid hormone binds to receptors on the ______. which then release __________ ligand

A

Osteoblast; osteoprotegerin

24
Q

Osteoprotegerin ligand activates receptors on _______ cells, which causes them to mature into _______

A

preosteoclast cells; osteoclast

25
Excess of parathyroid hormone leads to ____ ______
Bone thinning
26
Stimulates body, bone growth
Pituitary growth hormone
27
Excess pituitary growth hormone in children leads to ______
Gigantism
28
Excess pituitary growth hormone in adults leads to ______
Acromegaly
29
Deficit of pituitary growth hormone in children leads to:
dwarfism
30
Green stick fracture:
bone is bent & incomplete break, usually seen in children
31
Comminuted fracture:
bone fragments = no blood supply, death to cells can happen quickly
32
Compression fracture:
found in limbs, vertebral column, could be from disease weakening the bone & then gravity the bone would become compressed
33
What goes into healing a fracture?
- Fracture hematoma formed from ruptured blood vessels - Soft callus forms (mixture of spongy bone & fibrocartilage) - Hard callus forms by mineralization of soft callus - Remodeling of hard callus to mature (compact/ spongy) bone
34
Inflammation of bone tissue caused by injury or infection
Osteitis
35
Inflammation of periosteum caused by trauma or infection
Periostitis
36
Inflammation of bone interior caused by bacteria, usually initially entering the bone via wound or via blood stream
Osteomyelitis
37
Can spread to the spongy bone (particularly of the vertebral bodies), resulting in bone & joint destruction
Tuberculosis
38
Benign Neoplasms:
Osteochondroma | osteoma
39
Malignant neoplasms:
``` Osteogenic sarcoma (osteosarcoma) multiple myeloma ```
40
Reduction in bone mass, most prevalent in middle aged & elderly women
Osteoporosis
41
Can lead to osteoporosis:
- Vit. C defincy | - osteoblast can't keep up w/ osteoclast = loss of bone density