ACE ACE - Personal Trainer Anatomy and Biomechanics 2 — Questions and Answers
Question 1: What is the primary function of the rotator cuff muscles?
- Elbow flexion
- Shoulder stabilization and rotation (Correct answer)
- Spinal extension
- Hip abduction
Correct answer: Shoulder stabilization and rotation
The rotator cuff (SITS muscles) stabilizes the glenohumeral joint and facilitates shoulder rotation and elevation.
Question 2: Which type of muscle fiber has the highest aerobic (oxidative) capacity?
- Type IIx
- Type IIa
- Type I (Correct answer)
- Type IIb
Correct answer: Type I
Type I (slow-twitch) fibers have the highest oxidative capacity, making them resistant to fatigue during endurance activities.
Question 3: What is the anatomical term for the front surface of the body?
- Posterior
- Lateral
- Anterior (Correct answer)
- Medial
Correct answer: Anterior
Anterior refers to the front or ventral surface of the body.
Question 4: Which joint is classified as a hinge joint?
- Hip
- Shoulder
- Elbow (Correct answer)
- Wrist
Correct answer: Elbow
The elbow (humeroulnar) joint is a hinge joint, allowing only flexion and extension in the sagittal plane.
Question 5: What is the term for the muscle responsible for the primary movement in a given exercise?
- Synergist
- Stabilizer
- Antagonist
- Agonist (prime mover) (Correct answer)
Correct answer: Agonist (prime mover)
The agonist, or prime mover, is the muscle primarily responsible for producing a desired movement.
Question 6: During a squat, which muscle group acts as the prime mover?
- Hamstrings
- Quadriceps (Correct answer)
- Calves
- Hip flexors
Correct answer: Quadriceps
The quadriceps are the prime movers during the concentric (rising) phase of a squat, extending the knee.
ACE ACE - Personal Trainer Anatomy and Biomechanics 2
What is the primary function of the rotator cuff muscles?