BHK Bachelor of Kinesiology MCQ 3 — Questions and Answers
Question 1: Which type of muscle fiber has the highest oxidative capacity and fatigue resistance?
- Type IIx (fast-twitch glycolytic)
- Type IIa (fast-twitch oxidative-glycolytic)
- Type I (slow-twitch oxidative) (Correct answer)
- Type IIb (super-fast glycolytic)
Correct answer: Type I (slow-twitch oxidative)
Type I slow-twitch fibers contain abundant mitochondria and myoglobin, giving them the highest oxidative capacity and greatest resistance to fatigue.
Question 2: In biomechanics, the moment of inertia of a rotating body is most influenced by:
- The angular velocity of the body
- The distribution of mass relative to the axis of rotation (Correct answer)
- The net torque applied to the body
- The coefficient of restitution
Correct answer: The distribution of mass relative to the axis of rotation
Moment of inertia depends on both the total mass and how that mass is distributed around the axis; mass farther from the axis increases inertia more.
Question 3: What is the primary function of the stretch-shortening cycle (SSC) in plyometric movements?
- To increase muscle fiber recruitment only
- To store and reuse elastic energy and enhance neural activation for greater power output (Correct answer)
- To reduce oxygen consumption during jumping
- To lengthen tendon structures permanently
Correct answer: To store and reuse elastic energy and enhance neural activation for greater power output
The SSC involves a pre-stretch (eccentric phase) that stores elastic energy in tendons and activates the stretch reflex, which is then released in the concentric phase to amplify power.
Question 4: During maximal aerobic exercise, cardiac output is most influenced by increases in:
- Heart rate primarily, with stroke volume plateauing early (Correct answer)
- Stroke volume primarily, with heart rate remaining constant
- Diastolic filling time only
- Peripheral vascular resistance
Correct answer: Heart rate primarily, with stroke volume plateauing early
While both components increase, stroke volume plateaus at moderate intensities, and further increases in cardiac output at high intensities are driven mainly by rising heart rate.
Question 5: The rotator cuff muscles are collectively responsible for which primary function at the glenohumeral joint?
- Primary flexion and extension
- Dynamic stabilization of the humeral head within the glenoid fossa (Correct answer)
- Trunk rotation during arm movement
- Elevation of the scapula
Correct answer: Dynamic stabilization of the humeral head within the glenoid fossa
The four rotator cuff muscles (SITS: supraspinatus, infraspinatus, teres minor, subscapularis) compress the humeral head into the glenoid, providing dynamic joint stability.
Question 6: Which assessment best measures an individual's anaerobic power?
- VO₂max treadmill test
- Wingate anaerobic test (Correct answer)
- Cooper 12-minute run
- Maximal oxygen uptake step test
Correct answer: Wingate anaerobic test
The Wingate test involves a 30-second all-out cycle sprint and measures both peak anaerobic power and anaerobic capacity from the power-time curve.
Question 7: Wolff's Law in kinesiology states that:
- Muscles hypertrophy in proportion to the number of motor units recruited
- Bone remodels and adapts its architecture in response to mechanical loads placed upon it (Correct answer)
- Tendons lengthen permanently after repeated stretching
- Cartilage regenerates faster under compressive loading
Correct answer: Bone remodels and adapts its architecture in response to mechanical loads placed upon it
Wolff's Law describes how bone tissue is deposited along lines of mechanical stress and resorbed where stress is absent, meaning bone structure reflects habitual loading.
BHK Bachelor of Kinesiology MCQ 3
Which type of muscle fiber has the highest oxidative capacity and fatigue resistance?