#1
Which of the following is not a function of skeletal muscles?
Storage of minerals
ExplanationSkeletal muscles do not store minerals; they primarily enable movement.
#2
What is the primary function of skeletal muscles?
Generating force to produce movement
ExplanationSkeletal muscles generate force for movement.
#3
Which structure connects skeletal muscles to bones?
Tendon
ExplanationTendons connect muscles to bones.
#4
Which of the following is a voluntary action controlled by skeletal muscles?
Walking
ExplanationWalking is a voluntary action controlled by skeletal muscles.
#5
Which type of muscle fibers are predominantly used for endurance activities?
Type I fibers (slow-twitch)
ExplanationType I fibers are suited for endurance activities due to their fatigue-resistant nature.
#6
Which mineral is essential for muscle contraction and relaxation?
Calcium
ExplanationCalcium is crucial for both muscle contraction and relaxation.
#7
Which neurotransmitter is responsible for signaling the contraction of skeletal muscles?
Acetylcholine
ExplanationAcetylcholine signals muscle contraction.
#8
What is the medical term for a sudden, involuntary contraction of a skeletal muscle?
Spasm
ExplanationA spasm is a sudden, involuntary muscle contraction.
#9
What is the term for the smallest functional unit of a skeletal muscle?
Sarcomere
ExplanationSarcomere is the basic unit of muscle contraction.
#10
Which of the following is a symptom of a muscle strain?
Muscle weakness
ExplanationMuscle weakness can result from a muscle strain.
#11
What is the term for the decrease in muscle size due to disuse or injury?
Atrophy
ExplanationAtrophy refers to the decrease in muscle size due to various factors.
#12
Which disorder is characterized by chronic widespread musculoskeletal pain?
Fibromyalgia
ExplanationFibromyalgia presents as chronic musculoskeletal pain.
#13
Which disorder is characterized by progressive weakness and degeneration of skeletal muscles?
Muscular dystrophy
ExplanationMuscular dystrophy leads to muscle weakness and degeneration.
#14
What is the primary energy source for skeletal muscle contraction during short bursts of intense activity?
Creatine phosphate
ExplanationCreatine phosphate is the primary energy source for short bursts of activity.
#15
Which enzyme breaks down acetylcholine to terminate muscle contraction?
Acetylcholinesterase
ExplanationAcetylcholinesterase terminates muscle contraction by breaking down acetylcholine.
#16
Which disorder is characterized by the autoimmune destruction of acetylcholine receptors at the neuromuscular junction?
Myasthenia gravis
ExplanationMyasthenia gravis involves autoimmune destruction of acetylcholine receptors.
#17
Which disorder is characterized by the abnormal accumulation of fibrous tissue in skeletal muscles, leading to contractures and weakness?
Dermatomyositis
ExplanationDermatomyositis involves fibrous tissue accumulation in muscles, causing weakness.