PQ 6.2 THE ANATOMY OF SKELETAL MUSCLE

What is the basic unit of skeletal muscle?

• Muscle fibre

• Muscle cell

• Myofibril

• Sarcomere

What is the connective tissue that binds groups of muscle fibres together?

• Perimysium

• Epimysium

• Endomysium

• Sarcolemma

What is the larger and stronger sheath of tissue that envelopes the entire muscle?

• Perimysium

• Epimysium

• Endomysium

• Sarcolemma

What is the name of the thread-like structures that run along the muscle fibre's length?

• Myofibrils

• Myosin

• Actin

• Sarcomeres

Which protein has an attachment site for actin?

• Myosin

• Troponin

• Tropomyosin

• Calcium

What is the function of troponin?

• Has a binding site for calcium

• Covers the binding site on actin

• Allows myosin head to attach

• Stores glycogen

What is the name of the network of web-like channels involved in muscle activation?

• Sarcoplasmic reticulum

• Periosteum

• Endomysium

• Epimysium

What is the term for the complex linkages between the muscular system and the nervous system?

• Neuromuscular system

• Skeletal system

• Cardiovascular system

• Respiratory system

What chemical is released at the neuromuscular junction to initiate muscle contraction?

• Acetylcholine

• Adrenaline

• Dopamine

• Serotonin

What is the term for a single nervous impulse and the resulting contraction?

• Muscle twitch

• Motor unit

• Sarcomere

• Myofibril