Visible body 14.a practice quiz - Skeletal Muscle Tissue Multiple Choice

The neurotransmitter released by motor neurons that stimulates skeletal muscle is called: a. Acetylcholine b. Norepinephrine c. Acetylcholinesterase d. Epinephrine

a. Acetylcholine

Sarcomeres contain: a. Actin and myosin filaments b. Actin filaments and epimysium c. Fascicles and motor neurons d. Myofibrils and capillaries

a. Actin and myosin filaments

Which best describes the structural components of skeletal of skeletal muscle from largest to smallest? a. Fascicle, fiber, myofibril, thick and thin filaments b. Fiber, fascicle, thick and thin filaments, myofibrils c. Thick filaments, thin filaments, myofibrils, fascicle, fiber d. Myofibril, thick filament, fascicle, thin filament

a. Fascicle, fiber, myofibril, thick and thin filaments

The three types of muscle tissue are: a. Skeletal, digestive, vascular b. Smooth, cardiac, skeletal c. Skeletal, smooth, striated d. Cardiac, skeletal, tendinous

b. Smooth, cardiac, skeletal

Which of the following occurs when the myosin heads bind to actin? a. The myosin heads are cocked for the next stroke b. The cross bridges are established c. The sarcoplasmic reticulum within a muscle fiber releases calcium ions d. Calcium ions binds to a protein complex

b. The cross bridges are established

The binding of _______ to the receptor to an ion channel causes the channel to open, allowing an influx of ______ ions into the muscle fiber. a. Calcium, sodium b. Acetylcholine, calcium c. Acetylcholine, sodium d. Sodium, acetylcholine

c. Acetylcholine, sodium

All of the following are characteristics of skeletal muscles, except: a. They are under voluntary control b. They are striated c. They are under involuntary control d. Their ability to contract, depends on the structure of their fibers and the surrounding nerves

c. They are under involuntary control

The proteins within a muscle cell are organized into large cells called: a. Sarcomeres b. Filaments c. Fascicles d. Myofibrils

d. Myofibrils

Which step of muscle contraction is called the "power stroke"? a. Troponin slides to reveal actin-binding sites b. Myosin filaments pull together and slide across one another c. The sarcoplasmic reticulum within a muscle fiber releases calcium ions d. Myosin heads move the actin filaments inward, shortening the sarcomere

d. Myosin heads move the actin filaments inward, shortening the sarcomere

The place where an impulse is transmitted from a motor neuron to a skeletal muscle is called the _________. a. Intercalated disc b. Myofibril c. Origin point d. Neuromuscular junction

d. Neuromuscular junction