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Summary WJEC (England) Eduqas A-Level Biology 3. Requirements for Life - Option B Human Musculoskeletal Anatomy - 3. Joints CA$6.50   Add to cart
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Summary WJEC (England) Eduqas A-Level Biology 3. Requirements for Life - Option B Human Musculoskeletal Anatomy - 3. Joints

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  • Course
  • Option B: Human Musculoskeletal Anatomy
  • Institution
  • WJEC

I achieved a high A* Grade in my final A-Level exams using these notes!!! I believe you can achieve an A* if you can memorise these notes! Simply use blurting, a method of active recall, to write everything you remember from the notes, then identify the parts you couldn’t remember, then repeat ...

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Document information

  • May 2, 2023
  • 1
  • 2021/2022
  • Summary

Subjects

  • joints
  • synovial joint

Written for

  • A/AS Level
  • WJEC
  • Biology
  • Option B: Human Musculoskeletal Anatomy
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By: rashmeensheikh2317 • 5 months ago

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a. Joints: where bones meet
immovable / sutures: bones grow together & fuse – cranium (moves during birth to fit out)
movable
gliding: any direction – vertebrae / ankle / wrist
hinge: one plane – knees / elbows
ball and socket: more than one plane – hip / shoulder


b. osteoarthritis – degenerative condition: articular cartilage broken down faster than replaced
cause: changes in collagen & glycoprotein
increase risk:
- age
- overweight – more strain on joints
- repeated vigorous flexing
- joint damage
- no genetic link
result: inflammation & swelling = pain & stiffness
- damaged/reduced cartilage: Increased friction between bones = spurs – limit movement
treatment: non-steroidal anti-inflammatory drugs / structured exercise / joint replacement
o Relief from long term pain o Surgical risks – increased blood clot / infection
o Reduced drug intake o Long recovery period
o Increased mobility o Increased dislocation risk
o Restore normal activity & quality of life o Time limit – increased risk with 2nd replacement


c. rheumatoid arthritis – autoimmune disorder:
immune system recognises joint tissue proteins as antigens – attacks bone & cartilage
increase risk: smoke / red meat / coffee / genetic
symptom: severe inflammation from increased blood flow & restricted movement (swelling & pain)
treatment: physiotherapy & NSAIDs & surgery


d. joints
1st order – seesaw 2nd order – wheelbarrow 3rd order – tweezers
middle = pivot middle = load middle = effort
force magnifier distance magnifier
tilting head standing on tiptoes biceps
o Fulcrum: where atlas o Fulcrum: toes o Fulcrum: elbow
meets skull o Load: body o Load: hand
o Load: skull o Effort: calf muscles o Effort: bicep muscles
o Effort: neck muscles


e. synovial joint
cartilage on articular surfaces – reduce friction
joint capsule + ligament (strong & flexible) – hold bones together
synovial membrane: secretes synovial fluid (lubricant & shock absorber) into synovial cavity


f. antagonistic muscles: pairs coordinate movement at joints – 1 contract & 1 relax
flexor (bend) & extensor (straighten)
Elbow:
- bicep: flexor – pulls radius = bend
- tricep: extensor – pulls ulna = straighten

tendons: strong connections between muscle & bone
86% collagen fibres – arranged in parallel
no elastic fibres: don’t stretch = ensures all movement of muscle passed to bone

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