6.6 Bone growth Flashcards Preview

Bio 364 Lecture Exam 1 > 6.6 Bone growth > Flashcards

Flashcards in 6.6 Bone growth Deck (19):
1

what are the 3 types of bone growth?

length, articular cartilage, width

2

how does bone grow in length

via hyaline cartilage at epiphyseal plate

3

how does bone growth in length begin?

interstitial cartilage growth followed by appositional cartilage growth

4

what are the 4 zones of bone growth (for length)

resting cartilage
proliferation
hypertrophy
calcification

5

what happens to the epiphyseal plate during bone growth in length?

it remains the same width

6

what is the zone of resting cartilage?

area of the epiphyseal plate nearest the epiphysis
has randomly arranged condrocytes that do not divide rapidly

7

what is the zone of proliferation?

the area of the epiphyseal plate that produces new cartilage through interstitial growth
condrocytes divide and form columns

8

what is the zone of hypertrophy?

the condrocytes formed in the zone of proliferation mature and enlarge

9

what is the zone of calcification?

hypertrophied condrocytes die after surrounding themselves with calcified cartilage
this is then changed to bone

10

why is there growth at articular cartilage?

so the epiphysis can grown in size

11

what types of bones experience growth at the articular cartilage most often?

bones that do not have an epiphysis like short bones

12

how does bone growth occur at the articular cartilage?

much like at the epiphyseal plate

13

does all growth at the articular cartilage become ossified?, like in the epiphyseal plate/line?

no, articular cartilage remains

14

describe bone growth in width

via appositional growth under the periosteum (new bone is added to outside)
osteoblasts under the periosteum lay down matrix in a ridge formations
Ridges get enhanced and the grooves deepen until they eventually form a tunnel around blood vessels and endosteum
concentric lamellar layers are added by osteoblasts to form an osteon
circumferential and interstitial lamellae are added prn

15

Whaat are2 factors that can affect bone growth?

nutrition
Hormones

16

Good nutrition is required for bone growth because

cell division requires energy and building blocks
matrix production requires Ca++, collagen
Vit D required for absorption of Ca++
Vit C required for collagen synthesis

17

Why is Vit D needed for bone growth?

it is required for absorption of Ca++

18

Why is Vit C needed for bone growth?

it is required for collagen synthesis

19

What are 3 types of hormones that affect bone growht?

growth hormone
thyroid hormone
sex hormones