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biomech > Long Quiz 2 & 3 > Flashcards

Long Quiz 2 & 3 Flashcards

1
Q

T OR F

when both the net muscle torque and the direction of angular motion at a joint are in the same direction, the work done by the muscles is said to be negative.

A

false

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2
Q

a 23 y/o gymnast performed right rtrunk rotation with both shoulder in abductionand both elbow in extension as part of her routine. describe the arthrokinematics movement at the shoulder joint as it moves into the abduction osteokinematically.

A

humeral head glides inferiorly

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3
Q

at which point of the tracing will less force be required to cause permanent deformation due to weakening of the tissue?

A

between points C (microscopic failure) and D (macroscopic failure)

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4
Q

a semiconductor worker reaches for an object approximately 36 inches in front of her. she flexed her shoulder and slightly bent her trunk. as the shoulder flexes, which bony part moves?

A

head of the humerus

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5
Q

as the forearm moves into supination, the radial head slides _____

A

opposite with the movement

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6
Q

a semiconductor worker reaches for an object approx. 36 inches in front of her. reaching is an example of an/a

A

open kinematic chain

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7
Q

T OR F

when two or more vector quantities act at the same time, we can use the rules of vector algebra to determine the overall effect.

A

true

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8
Q

T OR F

isometric construction of the hamstring produces work

A

false

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9
Q

T OR F

distractive forces is always early from and parallel to the joint surfaces

A

false

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10
Q

The following are multiaxial joints, except
- glenohumeral joint
- intercarpal joint
- acetabulofemoral joints
- none of the above

A

intercarpal joints

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11
Q

following the convex concave rule, when the convex surface of the joints moves, the Arthrokinematics movement within the joint occurs

A

in the opposite direction

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12
Q

T OR F

The amount of inertia, a body possesses is inversely proportional to its mass 

A

false

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13
Q

TRUE about the closed-packed position EXCEPT
- articulating surfaces are maximally congruent
- the ligaments are taut
- the joint is more mobile
- none of the above

A

the joint is more mobile

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14
Q

T OR F

injuries can also result from the repeated sustenance of relatively small forces

A

true

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15
Q

a 23 y/o gymnast performed right trunk rotation with both shoulder in abduction and both elbow in extension as part of her routine. what axis of rotation does her trunk movement occur?

A

y axis

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16
Q

lever system: lateral flexion of the head

A

first class

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17
Q

during a gym session, your coach instructed you to perform hammer curls. Hammer curls is an example of an _____

A

open kinematic chain

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18
Q

T OR F

it is better to step on by a woman wearing a spike heel than by the same woman wearing a smooth soled court shoe

A

true

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19
Q

T OR F

if the force applied causes the deformation to exceed the structure’s yield point some amount of the deformation is permanent

A

true

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20
Q

T OR F

when the child sits in a playground swing, the child weight creates tension in the chain, supporting the swing. a heavier child create less tension in the supports of the swing.

A

false

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21
Q

T OR F

friction force is a shear force that is always parallel to the contracting surfaces.

A

true

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22
Q

T OR F

using the third law of motion, when a 90 kg ice hockey player collides head on with an 80 kg player. The first player exerts a force of 450 N on the second player and the second player also exert the same amount of force on player one.

A

false

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23
Q

lever system: a person doing push up

A

2nd class

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24
Q

T OR F
The center of gravity of a normal healthy adult is located anterior to the second sacral vertebra.

A

true

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25
Q

a 23 y/o gymnast performed right rtrunk rotation with both shoulder in abductionand both elbow in extension as part of her routine. the elbow joint is an example of a _____ joint

A

uniaxial

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26
Q

how much compressive stress is present on the L1 L2 vertebral disc of a 625 N woman given that approximately 45% of body weight is supported by the disc (a) when she stands in anatomical position?
assume that the desk is oriented horizontally and that its surface area is 20 cm²

A

14 N/cm^2

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27
Q

T OR F

when a defensive football player running down, the field is blocked by an opposing player. The velocity of the defensive player, following contact, is a function of the players original direction and speed, and the direction and magnitude of the force exerted by an offensive player.

A

true

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28
Q

T OR F

Force acting at the knee joint in a direction by the length of the tibial plateau is a compressive forces of the knee.

A

false

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29
Q

sliding of the carpal bones is an example of ____

A

rectilinear motion

30
Q

the x axis of the stress-strain graph is ?

A

percentage of deformation or change in length

31
Q

how much compressive stress is present on the L1 L2 vertebral disc of a 625 Newton woman given that approximately 45% of body weight is supported by the disc when she stands erect holding a 222 Newton suitcase? (assume that the disc is oriented horizontally and that its surface area is 20cm^2)

A

25.2 N/cm^2

32
Q

hey semiconductor worker reaches for an object, approximately 36 inches in front front of her. She flexed her shoulder and slightly bent her trunk. What plane of motion does her trunk rotation occur?

A

sagittal or frontal

33
Q

spinal abnormalities may be:

congential
from a disease
poor posture
all of the above

A

all of the above

34
Q

“ if you want to pick up your pen on the floor what is the most appropriate lifting technique?”

A

golfer’s lift

35
Q

signs and symptoms of work related musculoskeletal disorder

A

painful joints, inflammation, finger and toes turning white

36
Q

it is also known as the vertebra prominence

A

C7

37
Q

TRUE about the 1st cervical vertebra
- aka the axis
- it has no body
- movement available is cervical rotation
- considered a typical vertebra

A

it has no body

38
Q

T OR F

when doing your tasks you should follow the 90-90 rule because the muscle produces the greatest amount of tension at that position.

A

true

39
Q

which position gives the least amount of pressure to the IV disc?

A

supine

40
Q

which of the following is a manifestation of good posture?

A

ears are aligned with the tip of the shoulder in sitting

41
Q

when does the cervical region of the spine develops?

A

When infant learns how to lift the head in prone

42
Q

Center of gravity in standing for normal and healthy adults

A

Anterior to S2 S2

43
Q

The invertible disc is approximately

A

1/4 of the height of the spine

44
Q

which position increases stability?

A

Standing feet apart

45
Q

which of the following is not a function of the vertebral column?

  • Protects the spinal cord
  • Supports HAT against the force of gravity
  • Transmit forces of the upper and lower limb
  • None of the above
A

none of the above

46
Q

General term that refers to any type of back pain caused by strain on muscles of the vertebral column and abnormal stress

A

mechanical back pain

47
Q

TRUE about thoracic vertebra EXCEPT
- body is kidney shaped
- articulates the ribs
- all are typical
- none of the above

A

body is kidney shaped

48
Q

injury at the elbow region caused by frequent and forceful gripping

A

lateral epicondylitis and tennis elbow

49
Q

T OR F

Pushing is better than pulling

A

true

50
Q

T OR F

scoliosis is work related musculoskeletal disorder

A

false

51
Q

lifting with a straight lumbar and thoracic spine

A

traditional lifting

52
Q

frequent twisting, when transferring heavy object at work may affect

A

facet joint

53
Q

the study of work

A

ergonomics

54
Q

A pregnant engineer was diagnosed with low back pain. She was working part time since she got pregnant. is her condition work related?

A

No

55
Q

The following can be affected by work-related musculoskeletal disorders

A

Nerves tendon bones, ligaments

56
Q

The facet joint can sustain

A

Rotational load and compressive load

57
Q

systematic process of identifying hazards, and evaluating any associated risks within a workplace

A

risk assessment

58
Q

what contributes to the higher COG of babies, as compared to adults and standing

A

Bigger head than the body

59
Q

t or f

Crossing of legs in sitting position is good, because it shifts your weight to one side; thus allowing the other side to relax

A

false

60
Q

Which of the following is a primary curve of the vertebral column?

A

Thoracic region

61
Q

work related, musculoskeletal disorder can cause

increase in productivity
lost time from work
decrease medical cause
all of the above.

A

lost time form work

62
Q

t or f

it is better to use the laptop tracked pad than an external mouse

A

false

63
Q

lifting model with the lumbar spine is in slight lumbar lordosis

A

deep squat lift, power lift, straight, leg lift

64
Q

musculoskeletal disorders can be work related if

A

It is work aggravated and it is caused by your work

65
Q

nerve injured in patients with carpal tunnel syndrome

A

Median nerve

66
Q

areas commonly affected by your work related musculoskeletal disorder

A

neck back hands wrists

67
Q

The science of anticipation, recognition, and evaluation in control of workplace hazards

A

industrial hygiene

68
Q

which of the following statements protects the spine?

  • Simultaneous reaching and twisting for a greater efficiency
  • Frequent twisting to transfer objects
  • Use of body weight when pulling or pushing objects
  • all of the above
A

Use of body weight, when pulling, or pushing objects

69
Q

t or f
in gripping activities, it is safe to grip handles with larger diameter than those with smaller ones

A

true

70
Q

t or f
standing for two hours is better than sitting for two hours

A

false

71
Q

The abdominal muscles contract _____when doing proper lifting techniques

A

wrong = concentrically
eccentrically or isometrically

72
Q

The following are risks for musculoskeletal disorder, EXCEPT

  • Repetitive motion
  • Awkward posture
  • forceful movement
  • all of the above
A

all of the above

biomech (6 decks)

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