Ossification Flashcards

1
Q

what happens to new cartilage?

A

it is continuously being formed

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2
Q

what opens up a medullary cavity/marrow?

A

enclosed cartilage being digested away

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3
Q

builds bones

A

osteoblasts

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4
Q

what happens to older cartilage during ossification?

A

it ossifies or becomes bone

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5
Q

what happens to the cartilage for it to become bone?

A

gets covered by bone matrix and then its broken down

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6
Q

fetus has what type of bone

A

cartilage enclosed by “bony” bones

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7
Q

bones do what until growth stops

A

remodeling and lengthening

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8
Q

what two factors effect the remodeling of bones?

A

blood calcium levels and pull of gravity and muscles on skeleton

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9
Q

what replaces cartilage with bone?

A

osteoblasts

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10
Q

PTH

A

parathyroid hormone

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11
Q

what does PTH do?

A

signals to break down bones to get more calcium in blood if needed

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12
Q

how does gravity and muscle effect bones?

A

determines where the bone matrix is broken down or formed so the skeleton can stay strong

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13
Q

appositional growth

A

bones grow in width

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14
Q

what is growth controlled by?

A

hormones and during puberty sex hormones

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15
Q

when does bone growth end?

A

adolescence when epiphyseal plates are converted to bone (epiphyseal line)

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