Long Quiz 2 & 3 Flashcards
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.
false
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.
humeral head glides inferiorly
at which point of the tracing will less force be required to cause permanent deformation due to weakening of the tissue?
between points C (microscopic failure) and D (macroscopic failure)
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?
head of the humerus
as the forearm moves into supination, the radial head slides _____
opposite with the movement
a semiconductor worker reaches for an object approx. 36 inches in front of her. reaching is an example of an/a
open kinematic chain
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.
true
T OR F
isometric construction of the hamstring produces work
false
T OR F
distractive forces is always early from and parallel to the joint surfaces
false
The following are multiaxial joints, except
- glenohumeral joint
- intercarpal joint
- acetabulofemoral joints
- none of the above
intercarpal joints
following the convex concave rule, when the convex surface of the joints moves, the Arthrokinematics movement within the joint occurs
in the opposite direction
T OR F
The amount of inertia, a body possesses is inversely proportional to its mass 
false
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
the joint is more mobile
T OR F
injuries can also result from the repeated sustenance of relatively small forces
true
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?
y axis
lever system: lateral flexion of the head
first class
during a gym session, your coach instructed you to perform hammer curls. Hammer curls is an example of an _____
open kinematic chain
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
true
T OR F
if the force applied causes the deformation to exceed the structure’s yield point some amount of the deformation is permanent
true
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.
false
T OR F
friction force is a shear force that is always parallel to the contracting surfaces.
true
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.
false
lever system: a person doing push up
2nd class
T OR F
The center of gravity of a normal healthy adult is located anterior to the second sacral vertebra.
true
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
uniaxial
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
14 N/cm^2
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.
true
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.
false
sliding of the carpal bones is an example of ____
rectilinear motion
the x axis of the stress-strain graph is ?
percentage of deformation or change in length
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)
25.2 N/cm^2
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?
sagittal or frontal
spinal abnormalities may be:
congential
from a disease
poor posture
all of the above
all of the above
“ if you want to pick up your pen on the floor what is the most appropriate lifting technique?”
golfer’s lift
signs and symptoms of work related musculoskeletal disorder
painful joints, inflammation, finger and toes turning white
it is also known as the vertebra prominence
C7
TRUE about the 1st cervical vertebra
- aka the axis
- it has no body
- movement available is cervical rotation
- considered a typical vertebra
it has no body
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.
true
which position gives the least amount of pressure to the IV disc?
supine
which of the following is a manifestation of good posture?
ears are aligned with the tip of the shoulder in sitting
when does the cervical region of the spine develops?
When infant learns how to lift the head in prone
Center of gravity in standing for normal and healthy adults
Anterior to S2 S2
The invertible disc is approximately
1/4 of the height of the spine
which position increases stability?
Standing feet apart
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
none of the above
General term that refers to any type of back pain caused by strain on muscles of the vertebral column and abnormal stress
mechanical back pain
TRUE about thoracic vertebra EXCEPT
- body is kidney shaped
- articulates the ribs
- all are typical
- none of the above
body is kidney shaped
injury at the elbow region caused by frequent and forceful gripping
lateral epicondylitis and tennis elbow
T OR F
Pushing is better than pulling
true
T OR F
scoliosis is work related musculoskeletal disorder
false
lifting with a straight lumbar and thoracic spine
traditional lifting
frequent twisting, when transferring heavy object at work may affect
facet joint
the study of work
ergonomics
A pregnant engineer was diagnosed with low back pain. She was working part time since she got pregnant. is her condition work related?
No
The following can be affected by work-related musculoskeletal disorders
Nerves tendon bones, ligaments
The facet joint can sustain
Rotational load and compressive load
systematic process of identifying hazards, and evaluating any associated risks within a workplace
risk assessment
what contributes to the higher COG of babies, as compared to adults and standing
Bigger head than the body
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
false
Which of the following is a primary curve of the vertebral column?
Thoracic region
work related, musculoskeletal disorder can cause
increase in productivity
lost time from work
decrease medical cause
all of the above.
lost time form work
t or f
it is better to use the laptop tracked pad than an external mouse
false
lifting model with the lumbar spine is in slight lumbar lordosis
deep squat lift, power lift, straight, leg lift
musculoskeletal disorders can be work related if
It is work aggravated and it is caused by your work
nerve injured in patients with carpal tunnel syndrome
Median nerve
areas commonly affected by your work related musculoskeletal disorder
neck back hands wrists
The science of anticipation, recognition, and evaluation in control of workplace hazards
industrial hygiene
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
Use of body weight, when pulling, or pushing objects
t or f
in gripping activities, it is safe to grip handles with larger diameter than those with smaller ones
true
t or f
standing for two hours is better than sitting for two hours
false
The abdominal muscles contract _____when doing proper lifting techniques
wrong = concentrically
eccentrically or isometrically
The following are risks for musculoskeletal disorder, EXCEPT
- Repetitive motion
- Awkward posture
- forceful movement
- all of the above
all of the above
