Muscle Mastery: Skeletal Muscle Contraction & Motor Units

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Advanced muscle physiology

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S H

United States

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Muscle Mastery: Skeletal Muscle Contraction & Motor Units


Froggy Jumps Muscle Mastery: Skeletal Muscle Contraction & Motor UnitsOnline version Advanced muscle physiology by S H 1 Which interaction causes muscle contraction through cross-bridge cycling? a Actin filaments actively shorten as ATP breaks them down b Myosin binding to actin filaments c Calcium binds directly to myosin and shortens the thick filament 2 Which muscle type has the highest capillary density and mitochondrial content per length? a Type I (slow-twitch) skeletal fibers b Cardiac muscle fibers c Type IIb (fast glycolytic) fibers 3 What is the primary regulator of cross-bridge cycling in skeletal muscle? a Sodium influx through voltage-gated channels b Myosin detachment from actin without ATP c Calcium binding to troponin C 4 When a muscle needs to produce more force, how does the body increase the strength of contraction? a By activating larger motor units first b By recruiting additional motor units c By increasing the length of the muscle fibers 5 In excitation–contraction coupling, which event directly triggers Ca²⁺ release from the sarcoplasmic reticulum (SR)? a Calcium binding to troponin b ATP binding to myosin c The action potential traveling down the T-tubule 6 Which type of contraction occurs when a muscle lengthens under tension? a Concentric contraction b Eccentric contraction c Isometric contraction 7 Which fiber type is most fatigue-resistant and suited for endurance activities? a Type I (Slow oxidative) fibers b Type II (fast oxidative-glycolytic) fibers c Type IIA (fast glycolytic) fibers 8 What is the primary difference between Type IIA and Type IIB (IIx) fibers? a Presence of troponin in sarcolemma b Oxidative capacity and contraction speed vs glycolytic bias c Existence of actin filaments 9 Which mechanism explains increased force generation at higher velocity in SOME muscles? a Cross-bridge detachment prevention b Force-velocity relationship with eccentric emphasis c Length-tension curve shift 10 What role do t-tubules play in skeletal muscle physiology? a Store calcium for release b Propagate action potentials into the fiber interior c Anchor actin filaments exclusively 11 A patient presents with weakness when attempting to rotate their trunk to the left. Examination reveals damage to the right side of the abdominal wall. Which muscle is most likely injured? a Right internal oblique b Right external oblique c Left external oblique 12 A patient has drooping of the lower lip and difficulty depressing the mandible. Which superficial neck muscle may be involved? a Sternocleidomastoid b Platysma c Buccinator 13 A construction worker sustains an injury that prevents him from initiating forearm supination when his elbow is flexed at 90°. Which muscle is most likely compromised? a Brachialis b Deltoid c Biceps brachii 14 A patient demonstrates “winging” of the scapula when pushing against a wall. Which primary action is impaired due to weakness of the affected muscle? a Scapular protraction b Scapular retraction c Shoulder adduction 15 Following abdominal surgery, a patient is unable to effectively increase intra-abdominal pressure during forced expiration but can still perform trunk flexion. Which muscle is most likely weakened? a External oblique b Rectus abdominis c Transversus abdominis 16 During a standard push-up, which muscle is primarily responsible for drawing the humerus toward the midline as the body rises? a Deltoid (middle fibers) b Pectoralis major c Serratus anterior 17 During heavy lifting, which muscle is most responsible for flexing the hip to lift the thigh toward the torso? a Rectus abdominis b Iliopsoas c External oblique 18 A muscle that compresses abdominal contents but does NOT produce trunk rotation is: a Rectus abdominis b External oblique c Transversus abdominis 19 During forced inspiration, which muscle contributes by elevating the ribs? a External intercostals b Internal intercostals c Rectus abdominis 20 If the right external oblique contracts concentrically, the trunk will primarily rotate: a To the right b To the left c Into extension 21 Identify the muscle in the image. a Platysma b Thyrohyoid c Sternocleidomastoid 22 Identify the muscle in the image a Subclavius b latissimus dorsi c Pectoralis minor 23 Identify the muscle in the image. a Flexor Carpi Radialis b Extensor Carpi Radialis c Brachioradialis 24 Identify the muscle highlighted green. a Brachioradialis b Palmaris Longus c Pronator teres 25 Identify the muscle in the image a Flexor carpi ulnaris b Extensor carpi ulnaris c Flexor digitorum profundus

Muscle Mastery: Skeletal Muscle Contraction & Motor Units

Froggy Jumps

About this activity

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Muscle Mastery: Skeletal Muscle Contraction & Motor UnitsOnline version

by S H

Which interaction causes muscle contraction through cross-bridge cycling?

Which muscle type has the highest capillary density and mitochondrial content per length?

What is the primary regulator of cross-bridge cycling in skeletal muscle?

When a muscle needs to produce more force, how does the body increase the strength of contraction?

In excitation–contraction coupling, which event directly triggers Ca²⁺ release from the sarcoplasmic reticulum (SR)?

Which type of contraction occurs when a muscle lengthens under tension?

Which fiber type is most fatigue-resistant and suited for endurance activities?

What is the primary difference between Type IIA and Type IIB (IIx) fibers?

Which mechanism explains increased force generation at higher velocity in SOME muscles?

What role do t-tubules play in skeletal muscle physiology?

A patient presents with weakness when attempting to rotate their trunk to the left. Examination reveals damage to the right side of the abdominal wall. Which muscle is most likely injured?

A patient has drooping of the lower lip and difficulty depressing the mandible. Which superficial neck muscle may be involved?

A construction worker sustains an injury that prevents him from initiating forearm supination when his elbow is flexed at 90°. Which muscle is most likely compromised?

A patient demonstrates “winging” of the scapula when pushing against a wall. Which primary action is impaired due to weakness of the affected muscle?

Following abdominal surgery, a patient is unable to effectively increase intra-abdominal pressure during forced expiration but can still perform trunk flexion. Which muscle is most likely weakened?

During a standard push-up, which muscle is primarily responsible for drawing the humerus toward the midline as the body rises?

During heavy lifting, which muscle is most responsible for flexing the hip to lift the thigh toward the torso?

A muscle that compresses abdominal contents but does NOT produce trunk rotation is:

During forced inspiration, which muscle contributes by elevating the ribs?

If the right external oblique contracts concentrically, the trunk will primarily rotate:

Identify the muscle in the image.

Identify the muscle in the image

Identify the muscle in the image.

Identify the muscle highlighted green.

Identify the muscle in the image