Muscle Physiology Review

What are thick filaments made of?

• Actin

• Myosin

• Sarcolemma

• Sarcomere

What are thin filaments mostly made of?

• Actin

• Myosin

• Sarcolemma

• Sarcomere

The epimysium covers

• The whole muscle

• Fasicles

• Muscle fibers

• Myofibrils

The perimysium covers

• The whole muscle

• Fasicles

• Muscle fibers

• Myofibrils

Which muscle tissue is classified as striated, but involuntary?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• The brain

One neuron and the skeletal muscle it stimulates is known as a

• Sarcoplasmic reticulum

• Motor unit

• Synaptic cleft

• Neuromuscular junction

Anaerobic metabolism requires ____ to make ATP

• Creatine phosphate

• Oxygen

• Glucose

• Both oxygen and glucose

Tags

NGSS.HS-LS2-3

Smooth muscles are

• Multinucleate

• Involuntary

• Branched

• Cylindrical

Why are calcium ions necessary for skeletal muscle contraction?

• calcium increases the action potential transmitted along the sarcolemma

• calcium releases the inhibition on Z discs

• calcium triggers the binding of myosin to actin and starts the chain reaction after a nerve impulse

• calcium causes ATP binding to actin

Acetylcholine is

• A source of energy for muscle cells

• A component of thick myofilaments

• An oxygen-binding proteins

• The essential neurotransmitter for muscle contraction