Biomechanics 1
A force is any influence that causes an object to undergo a certain change. There are three types of change that can occur with an applied force. What are they?
Change in DIRECTION
Change in MOVEMENT
Change in STRUCTURE
How do crutches affect stability?
Widen/make bigger the base of support
What property of muscle allows it to respond to stimuli?
Excitability
What is the innervation of the gastrocnemius?
Tibial Nerve
What two muscles are responsible for elbow extension?
Triceps Brace & Anconeus
What is it called when forces occur along the same line of pull?
Linear Force
What are the three major components of stability?
Center of Gravity
Base of Support
Line of Gravity
This law states that bone tissue, when placed under stress, will form stronger bone
Wolff's Law
What is the superior border of the femoral triangle?
Inguinal Ligament
What are the three components of posture?
Symmetry, Alignment, Balance
Rotary motion depends on 2 factors. What are they?
The amount of force exerted
The distance from the force to the axis
In an average human, where is the Center of Gravity found
At the second sacral vertebrae at the midline of the body
A suture is what classification of joint?
Fibrous
What is the insertion of the Vastus Intermedius?
Tibial Tuberosity
Which ribs are true, false, floating?
Ribs 1-7: True
Ribs 8-10: False
Ribs 11 & 12: Floating
What is Newton's Second Law of Motion?
Acceleration
The acceleration of an object is directly proportional to the force acting upon it and is inversely proportional to its mass.
Give an example of an unstable equilibrium.
Any example where object's stability is easily disturbed by a small force and CoG is elevated
The sartorius has what muscle belly design?
Strap Design
What are the two actions of the Tibialis Posterior?
Inversion & Plantarflexion
What is the innervation of the Teres Major?
Lower Subscapular Nerve
What is it called when parallel forces act together in opposite directions, leading to a rotational force?
In terms of stability, what is the relationship between the Line of Gravity and the Base of Support?
The closer the Line of Gravity is to the center of the Base of Support, the more stable the object.
Motor impulses sent from your brain to your muscles are transmitted by what type of neuron?
Efferent
Equinas gait occurs due to which muscular structures being weak?
Ankle Dorsiflexors
Which two postural distortions involve a posteriorly tilted pelvis?
Flatback & Swayback