Muscle and Nervous System Quiz

Which muscle types are involuntary?

• Smooth and skeletal

• Cardiac and skeletal

• Smooth and cardiac

• All three

What does the perimysium surround in skeletal muscle?

• Individual muscle fibers

• Whole muscle

• Groups of muscle fibers (fascicles)

• Tendons

Which connective tissue layer surrounds the entire skeletal muscle?

• Perimysium

• Endomysium

• Epimysium

• Sarcolemma

What is the sarcomere?

• The muscle cell membrane

• The smallest contractile unit of muscle

• A connective tissue layer

• A motor neuron

What are the main protein filaments found in a sarcomere?

• Collagen and elastin

• Myosin and actin

• Actin and keratin

• Troponin and tropomyosin

During muscle contraction, what happens to the sarcomere?

• It lengthens

• It breaks down

• It shortens

• It disappears

What is the name of the junction where a motor neuron communicates with a muscle fiber?

• Synaptic cleft

• Neuromuscular junction

• Axon hillock

• Motor cortex

After acetylcholine binds to its receptors, what happens next in the muscle fiber?

• Calcium is released from the neuron

• Sodium channels open, causing depolarization

• ATP is immediately broken down

• Myosin binds to actin

In a relaxed muscle, what is the position of tropomyosin?

• Blocking the binding sites on actin

• Unwound from myosin

• Bound to ATP

• Attached to the sarcolemma

What is the role of troponin in muscle contraction?

• Hydrolyzes ATP

• Stores calcium

• Binds calcium and moves tropomyosin

• Generates force for contraction