S&C Chapter 1

Which skeleton includes the ribs?

• Appendicular

• Axial

• Pelvic

• Cranial

Which structure surrounds a single muscle fiber?

• Sarcolemma

• Tendon

• Epimysium

• Fasciculus

What are the two types of myofilaments?

• Actin and Myosin

• Sarcoplasm and Sarcolemma

• Endomysium and Perimysium

• Epimysium and Fasciculus

What surrounds each muscle fiber?

• Sarcoplasm

• Sarcolemma

• Sarcoplasmic reticulum

• Myofibrils

What is the main purpose of the myelin sheath?

• To protect the neuron

• To speed up signal transmission

• To store neurotransmitters

• To connect to muscle fibers

What is the significance of the H-zone?

• Contains only actin filaments

• Contains only myosin filaments

• Contains both actin and myosin filaments

• Contains no filaments

Where is calcium released from during muscle contraction?

• Mitochondria

• Sarcoplasmic reticulum

• Nucleus

• Golgi apparatus

What occurs during the relaxation phase of muscle action?

• Calcium is released.

• Myosin crossbridge heads attach to actin.

• Neural input stops and calcium is pumped out.

• ATP is replenished.

What is the sequence of events in the sliding-filament theory?

• Resting, Excitation, Contraction, Recharge, Relaxation

• Excitation, Resting, Contraction, Relaxation, Recharge

• Contraction, Recharge, Relaxation, Resting, Excitation

• Relaxation, Recharge, Contraction, Excitation, Resting

What initiates the sequence of events in muscle action?

• Muscle contraction

• Action potential in motor neuron

• Calcium ion release

• ATP hydrolysis