NCBTMB Kinesiology and Biomechanics 4

Question 1

The term 'agonist' in muscle function refers to:

Accepted Answer

The primary muscle responsible for producing a movement

Answer

The agonist (prime mover) is the muscle primarily responsible for producing the desired movement at a joint.

Question 2

Scapular winging is most commonly caused by weakness of which muscle?

Accepted Answer

Serratus anterior

Answer

Serratus anterior weakness allows the medial border of the scapula to lift away from the thoracic wall, producing the characteristic winging appearance.

Question 3

Which joint in the ankle is primarily responsible for dorsiflexion and plantarflexion?

Accepted Answer

Talocrural (tibiotalar) joint

Answer

The talocrural (tibiotalar) joint is the true ankle joint and is the primary site for dorsiflexion and plantarflexion movements.

Question 4

Reciprocal inhibition refers to the phenomenon where:

Accepted Answer

Contraction of the agonist causes reflex relaxation of the antagonist

Answer

Reciprocal inhibition is a neurological reflex where activation of the agonist causes simultaneous inhibition (relaxation) of the antagonist muscle.

Question 5

The Q-angle is a clinical measurement relevant to which joint?

Accepted Answer

Patellofemoral joint

Answer

The Q-angle (quadriceps angle) measures the alignment between the quadriceps pull and the patellar tendon, making it clinically relevant to patellofemoral joint mechanics.

NCBTMB Exam Practice Test

NCBTMB Exam Practice Test

NCBTMB Kinesiology and Biomechanics 4