Skeletal Muscle Anatomy

What is the basic structural unit of a muscle fiber?

• troponin

• actin

• sarcomere

• myofibril

Which structure surrounds a bundle of muscle fibers?

• Endomysium

• Epimysium

• Haversian system

• Perimysium

What is the connective tissue that surrounds individual muscle fibers?

• Epimysium

• Myofibril

• Perimysium

• Endomysium

Which connective tissue surrounds a group of muscle fibers?

• Hyaline cartilage

• Endomysium

• Perimysium

• Epimysium

What is the plasma membrane of a muscle fiber called?

• sarcoplasm

• myofilament

• sarcolemma

• myofibril

What is the cytoplasm of a muscle fiber called?

• sarcoplasm

• cytosol

• myofibril

• nucleoplasm

What is the functional unit of a muscle fiber?

• myofibril

• actin

• troponin

• sarcomere

Which structure stores calcium ions in a muscle fiber?

• endoplasmic reticulum

• myofibril

• sarcoplasmic reticulum

• mitochondria

What is the motor neuron and all the muscle fibers it innervates called?

• Nerve bundle

• Motor unit

• Neural network

• Muscle cluster

Which structure is responsible for the contraction of a muscle fiber?

• Troponin

• Myofibril

• Actin

• Sarcomere