Muscle Structure Quiz

What is the function of cardiac muscle?

• Movement of bones

• Pumping blood

• Digestive processes

• Breathing

What are the two types of myofilaments mentioned in the image?

• Actin and Myosin

• Collagen and Elastin

• Keratin and Fibrin

• Tubulin and Dynein

Which structure is responsible for muscle contraction within the muscle fiber?

• Mitochondrion

• Myofibril

• Sarcolemma

• Nucleus

What is the role of mitochondria in muscle fibers?

• Store calcium ions

• Produce energy

• Transmit signals

• Form the sarcolemma

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

Which component of the muscle fiber is responsible for its contraction?

• Sarcolemma

• Myofibril

• Sarcoplasmic reticulum

• Nucleus

What is the role of nuclei in muscle cells?

• Store calcium

• Control cell activities

• Produce energy

• Conduct impulses

Which structure is labeled as the 'I band' in a sarcomere?

• Area with only actin filaments

• Area with only myosin filaments

• Overlapping area of actin and myosin

• Central region of the sarcomere

What is the smallest unit in the muscle hierarchy?

• Fascicles

• Myofibrils

• Myofilaments

• Bundles

What is the relationship between myofibrils and myofilaments?

• Myofibrils are composed of myofilaments

• Myofilaments are composed of myofibrils

• They are the same structure

• Myofibrils create light bands

Which structure in the neuromuscular junction is responsible for receiving the nerve signal?

• Postsynaptic membrane

• Sarcolemma

• Mitochondrion

• Axon of motor junction