- Prevents excessive ankle inversionCommonly injured in sports injuries (inversion injury)
- Which of these is not a suprahyoid muscle?A) GenioglossusB) GeniohyoidC) StylohyoidD) MylohyoidE) Digastric
- The resting membrane potential (RMP) for a skeletal muscle cell isA) - 90 mvB) - 30 mvC) 1.5 mvD) 12 mv
- Muscles fibers are arranged in bundles called:A) compartmentsB) fasciclesC) retinaculaD) aponeurosesE) groups
- Which of the following muscles does not contribute to the rotor cuff?A) Teres minorB) Teres majorC) SubscapularisD) InfraspinatusE) Supraspinatus
- Rigor Mortis begins because:A) The sarcoplasmic reticulum degenerates and Ca+2 is releasedB) The sarcoplasmic reticulum degenerates and ATP is releasedC) The Na+ channels in the sarcolemma degenerate and Na+ flows into the cellD) The synaptic knob degenerates and releases acetylcholine
- The ability of the muscle cell to return to its initial length after being stretched is called________.A) excitabilityB) conductivityC) extensibilityD) elasticity
- The ability of the muscle cell to stretch under tension is known asA) excitabilityB) conductivityC) extensibilityD) elasticity
- The elasticity of skeletal muscle fibers is primarily due to the presence of this protein.A) titinB) globular actinC) troponinD) collagenE) tropomyosin
- The functional unit of a muscle fiber is the _________, a segment from one Z disc to the next.A) MyofibrilB) I bandC) SarcomereD) Neuromuscular junction E) Striation
- You are looking at muscle tissue through a microscope. You see striations, central nuclei andintercalated discs. This type of muscle tissue must be:A) skeletalB) smoothC) cardiacD) impossible to tell from the description
- The time lapse between the beginning of stimulus and the beginning of a twitch is called theA) refractory periodB) contraction phaseC) relaxation phaseD) latent period
- This chemical carries the stimulating message across the neuromuscular junctionA) synapseB) myosinC) potassiumD) acetylcholine
- Which of the following is a regulatory protein of muscle.A) actinB) myosinC) tropomyosinD) titin
- Fusiform cells are found in which muscle type.A) skeleton musclesB) cardiac musclesC) smooth muscles
- All of the following are structural components of the neuromuscular junction exceptA) synaptic knobB) junctional foldC) basal laminaD) T -TublesE) acetylecholine receptors
- Thick filaments consist mainly of the protein ______.
- Which of the following muscles is a flexor of the neck.A) splenius capitisB) trapeziusC) sternocleidomastoidD) semispinalis capitis
- Before a skeletal muscle fiber can contract, Ca2+ must bind toA) calsequestrinB) calmodulinC) the myosin head.D) troponin.E) actin.
- The thenar group of muscles can be found inA) the footB) the radial side of the forearmC) the deep buttockD) the base of the thumb