Practice Exam Flashcards
What structure is responislbe for the elastic behaviour of ligamnets?
Elastin
Ultimate stress occours at what point on the stress-strain relashionship curve?
Failure point
Weight acceptance occours during which component of the gait cycle?
Loading responce
The ability of a material to absorb energy during plastic deformation before failure is called what?
Toughness
By how much (of resting length) can a muscle stretch before rupture?
160%
The technique of surface EMG is NOT generally used to provide informactuion on what?
Single motor action potentials
What is a causative extrinsic factor that affects EMG signal?
Orientation of electrodes with respect to the direction of fibres
The hipand ankle positions during an isokinetic knee extension protocol are important conciderations as the alter the length of what?
Rectus femoris and Gastrocnemius
During an isokinetic testing protocol, what happens to the duration of the isokinetic phase as the angular velocity increases?
Decreases
What is a sport that displays bilateral facilitation?
Weightlifting
The measuremnt of the anatomical cross-section area of a muscle should be made…
Perpendicular to the long axis of the muscle
What is the advantage of an in-parallel muscle fibre arrangment?
Greater maximum force
What is the effect of the low and high pennation of the gastrocnemius have?
A pennate or pinnate muscle (also called a penniform muscle) is a muscle with fascicles that attach obliquely (in a slanting position) to its tendon.
These types of muscles generally allow higher force production but smaller range of motion When a muscle contracts and shortens, the pennation angle increases.
The contraction velocity of type 2 motor units compared to that of the type 1 motor units is
Three times greater
How do muscles with a small physiolagical cross-sectional area produce high joint torques?
By having a large moment arm
