The Skeletal System Flashcards

1
Q

bone tissue

A
  • made of protein collagen, hardened by calcium phosphate
  • two types of tissue:
  1. compact (cortical) = hard outer layer, dense/strong/durable
  2. spongy (cancellous/trabecular) - internal, lighter, less dense, flexible. consists of network of rod like structures
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2
Q

cellular components of bone -> osteoblasts

A

responsible for making new bone/repairing older

produce protein mixture -> osteoid = mineralized = bone

also manufacture hormones

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3
Q

cellular components of bone -> osteocytes

A

inactive osteoblasts (trapped in bone created)

maintain connections to cytes/blasts

important for communication w/in tissue

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4
Q

cellular components of bone -> osteoclasts

A

large cells, 1+ nucleus = break down bone

release enzymes/acids -> dissolve minerals = resorption

help remodel injured bones

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5
Q

bone function - protection

A

give a supportive structure or framework for the body

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6
Q

bone function - movement

A

attachments for tendons and muscles = movement

muscle contracts -> pull on bone = movement

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7
Q

bone function - boundary

A

boundary to thoracic, pelvic, cranial cavities

protective role for vital organs (hold in place -> efficient functioning)

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8
Q

bone function - RBC production

A

haemopoiesis (RBC production) in red bone marrow (spongy inside)

also produces WBC -> immune response

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9
Q

bone function - storage

A

area for Ca, P, Na, K

calcium = healthy bones/bp regulation
phosphorous = healthy bone/teeth
sodium and potassium = fluid balance, nerve transmits, muscles contract

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10
Q

long bones

A

consist of 2 extremities + shaft

found in limbs as bone is longer than width e.g. femur, tibia

role = strength/structure/mobility

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11
Q

structure of long bone

A

diaphysis = compact bone/central medullary canal/composed of fatty yellow bone marrow

epiphysis = outer cover of compact present, spongy = inside

periosteum = complex vascular 2 layer membrane (outer - fibrous = protection) (inner = osteoblasts + osteoclasts)

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12
Q

short bones

A

no extremities or shaft, different shape/size = roughly cube (same width and length)

e.g. carpals of the wrists

role = stability/some movement

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13
Q

irregular bones

A

no regular shape of characteristics

e.g. vertebra and some skull bones

role = protection of vital organs

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14
Q

flat bones

A

provide flat areas for muscle attachment, usually enclose cavities for organ protection

e.g. some skull bones, sternum and ribs

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15
Q

sesamoid bones

A

small bones developed in tendons around some joints

e.g. patella/knee cap

role = reinforce/decrease stress on tendon

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16
Q

axial skeleton

A

forms long axis of the body, includes bones of skull/spine/ribcage, and the clavicle

17
Q

axial skeleton -> spine bones

A

cervical (7) C1-C7 (C1 = atlas, sits on C2 = axis)

thoracic (12) T1-T12

lumbar (5) L1-L5

sacral (5 fused) S1-S5

coccygeal (4 fused)

18
Q

appendicular skeleton

A

bones of the upper and lower limbs and their girdles that join to the axial skeleton

19
Q

fibrous joints

A

structure -> tough connective tissue

function -> permit no movement + stability

e.g. joints between skull

20
Q

cartilagenous joints

A

structure -> connected entirely by cartilage

function -> acts as a shock absorber

e.g. rib

21
Q

synovial joints

A

structure -> space with a capsule between two articulating bones

function -> movement e.g. flexion and extension

e.g. shoulder

22
Q

features of synovial joints (structure + function)

A

ligament: band of strong fibrous tissue, connect bone to bone (stability)

synovial fluid: slippery fluid contained within joint cavity, reduce friction between articular cartilage and joint (mobility)

articular cartilage: spongy, covers ends of bones in the joint, absorb shock and prevent friction between end of bone and joint (mobility)

joint capsule: tough fibrous tissue (2 layers), strengthen joint and secretes synovial fluid (stability)

23
Q

types of synovial joints -> movements and examples

A

hinge = flexion/extension e.g. elbow

ball and socket = circumduction, flexion/extension, abduction/adduction e.g. shoulder

pivot = rotation e.g. atlas and axis

plane = gliding/sliding e.g. tarsals

saddle = rotation, circumduction, flexion/extension e.g. thumb

condyloid = flexion/extension, circumduction, abduction/adduction e.g. between radius and carpals

24
Q

connective tissue

A

made of collagen and elastin fibers

connect muscular and skeletal system

cartilage/ligaments/tendons

25
cartilage - structure and function
specialized connective tissue present in joints/ears/nose/rib cage/bronchial tubes/invertebrate discs avascular -> very slow healing shock absorption/joint lubrication/reduce friction
26
types of cartilage
hyaline - smooth/lines articular surfaces of all long bones/found in ribs and trachea/glassy/no nerves or blood vessels fibrous - tough and strong/lots of collagen elastic - main protein = elastin (flexible)/found in pinnae (external ear flap)
27
ligaments - structure and function
regular collagen fibers, slightly elastic, strong fibrous band of connective tissue connect bone to bone, control movement and stability of joints, support organs
28
tendons - structure and function
soft, connective tissue found throughout body, less elastic and arranged in parallel fibers transfers force between muscle and bone to crease movement
29
osteopenia
condition of lower than normal bone density
30
osteoarthritis (OA)
degenerative, slow onset affects fingers and weight bearing joints severe cartilage destruction -> rubbing of bone on bone
31
rheumatoid arthritis (RA)
autoimmune disorder, rapid or gradual onset (week/month) | affects bilateral joint involvement e.g. wrist, hand, elbow, feet
32
accessories of synovial joints
bursa (pl. bursae)​ - fibrous sac lines with synovial fluids, function = prevent friction​ meniscus (pl. menisci)​ - making the joint more stable and reducing wear and tear on joint surfaces.​ pad of fat​ - provides cushioning between the fibrous capsule and a bone or muscle.