TSM1.93 onwards

tsm1-93-onwards

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Question 1 of 1

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474459

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which of the following alse false regarding bone?

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474480

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match the phases of bone to its description

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Explanation

woven - osteoblasts lining a trabeculum of woven bone - some osteoblasts are in various stages of being surrounded by matrix and becoming osteoctyes osteon/haversian suystem --> outer cicumferential lamellae --> osteocytes with lacunae and canaliculi (inner circumfernetial lamellae) with central haversian canal two types of lammelar bone (mature) lamella = plate like

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woven bones
Haversian (lamellar) bone

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immature --> laid bone first during bone formation, irregular arrangement of collagen fibrils, persists in adults in a few sites such as tooth socket and brain sutures may be formed in fracture repair
mature bone, can be arranged as compact or trabecular, covered externally with two layers of periosteum--> outer layer = collagen and blood vessels, inner layer = osteoprogenitor cells, covered internally with endosteum (osteoprogenitor cells and reticular fibres)

474485

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what is the following a description of? cylindrical subunits aroranged around a central canal, surrounded cirumferentially by lamellae, cannaliculi are miscroscopic canals connecting lacunae, sharpeys fibres form inner connections, volkmanns canals contain blood vessels

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474494

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which of the following are components required for bone mineralisation?

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Explanation

osteoblasts secrete osteoid collagen vesicles deposit hydroxyapatite organic mineralised bone matrix components - osteoid collagen fibres, proteins and proteoglycans inorganic mineralised bone matrix components - hydroyapatite and other molecules

474512

120

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match these organic and inorganic components of bone matrix

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collagen type 1 fibres
proteoglycans
osteopontin and osteocalcin
hydroxyapatite

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inorganic component almost identical to calcium phosphate found in geological deposits, forms rod like crystals , crystals attach along the length of osteoid collagen fibres
organic component
organic bone matrix proteins, bind hydroxyapatite crystals, bind osteoblasts to bone matrix, osteocalcin is unique to bones and secreted by osteoblasts
organic component - consist of chondroitin sulfate and keratan sulphate and composed of a polypeptide back bone with glycosaminoglycan side chains

474514

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Bone calcification (mineralisation) occurs in matrix vesicles. Hydroxyapatite growth and seeding depends on Ca/PO4 concentration. Bone only forms where crystal nuclei can form. Normal tissue contains factors e.g. pyrophosphates)which prevents formation of crystal nuclei.

TSM1.93 onwards

Question 1 of 1

Time Left

which of the following alse false regarding bone?

Select the correct answer(s).

(0/0)

match the phases of bone to its description

Match the text (click and drag)

(0/0)

Explanation

woven bones

Haversian (lamellar) bone

immature --> laid bone first during bone formation, irregular arrangement of collagen fibrils, persists in adults in a few sites such as tooth socket and brain sutures may be formed in fracture repair

mature bone, can be arranged as compact or trabecular, covered externally with two layers of periosteum--> outer layer = collagen and blood vessels, inner layer = osteoprogenitor cells, covered internally with endosteum (osteoprogenitor cells and reticular fibres)

what is the following a description of? cylindrical subunits aroranged around a central canal, surrounded cirumferentially by lamellae, cannaliculi are miscroscopic canals connecting lacunae, sharpeys fibres form inner connections, volkmanns canals contain blood vessels

Select the correct answer(s).

(0/0)

which of the following are components required for bone mineralisation?

Select the correct answer(s).

(0/0)

Explanation

match these organic and inorganic components of bone matrix

Match the text (click and drag)

(0/0)

collagen type 1 fibres

proteoglycans

osteopontin and osteocalcin

hydroxyapatite

inorganic component almost identical to calcium phosphate found in geological deposits, forms rod like crystals , crystals attach along the length of osteoid collagen fibres

organic component

organic bone matrix proteins, bind hydroxyapatite crystals, bind osteoblasts to bone matrix, osteocalcin is unique to bones and secreted by osteoblasts

organic component - consist of chondroitin sulfate and keratan sulphate and composed of a polypeptide back bone with glycosaminoglycan side chains

Bone calcification (mineralisation) occurs in matrix vesicles. Hydroxyapatite growth and seeding depends on Ca/PO4 concentration. Bone only forms where crystal nuclei can form. Normal tissue contains factors e.g. pyrophosphates)which prevents formation of crystal nuclei.

Select the correct answer(s).

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