What do osteocytes do and why do they need canaliculi?
a)to respond to mechanical strain and to send signals of bone formation or bone resorption to the bone surface, b to communicate with other osteocytes
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15
Which synovial joint has the least range of motion?
gliding joints
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15
What is the consistency of synovial fluid and what is itโs purpose?
Viscous, ovial:egg like, non Newtonian, lubricates, supports the chondrocytes in the articular cartilage, shock absorber
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15
Where is yellow bone marrow primarily found?
In the meduliary cavity of long bones, Red bone marrow is found in the spaces of cancelous bone.
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15
label the structures of compact bone tissue and what is the whole cylindrical structure called?
a. lamella (concentric), b. lacuna, c. central (haversian) canal, d. canaliculi. Whole structure is the osteon. and(interstitial lamellae?)
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15
Explain the difference between proximal and distal.
proximal is closer to the point of attachment of a limb. Distal is farther from the point of attachment of a limb. The foot is distal to the knee
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15
explain the difference between medial and lateral.
Medial is closer to the mid line lateral is farther away from the midline. The nose is medial to the ear. the ear is lateral to the nose
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25
What are three reasons that bone might be needed to be reshaped by remodeling?
1. All new bone tissue is cancellous bone and some new bone needs to be compact bone, 2. Stress causes bones increase or decrease in size.3. growth
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15
What kind of cell builds the bone matrix?
Osteoblast. The osteoblast secretes collagen and blood provides the bone salts.
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15
A medical researcher shows you an epiphyseal plate that has been removed from an immature bone. The researcher wants to know which side of the plate was close to the diaphysis. Can you tell?
Yes, look for the side that is partially ossified. Remember the epiphyseal plate only grows on the side towards the diaphysis
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15
What does calcitonin do and why, and where does it come from?
It comes from the thyroid gland, and it reduces Ca+ levels in the blood by decreasing osteoclast activity
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25
When do bones need to be remodeled to their original shape? 3 reasons
1.to repair broken bones. 2. To replace worn out collagen or hydroxyapatite. 3. To regulate calcium levels in the body.
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15
When does your body secrete PTH and where does it come from?
When Ca+ levels in the blood drop, it come from the parathyroid gland. It causes an increase in osteoclast activity and a decrease in osteoblast activity