Muscle Contraction and Structure Quiz

What happens first in muscle contraction?

• Cross-bridge cycling

• Delivery of an action potential at the neuromuscular junction

• Myosin detachment

• Calcium release from the sarcoplasmic reticulum

A cross-bridge forms when which two specific components meet?

• Actin & troponin

• Myosin & ATP

• Myosin heads & myosin binding sites

• Calcium ions & troponin

A cross-bridge can only form when which two substances are present?

• ATP and calcium ions

• ADP and potassium ions

• ATP and acetylcholine

• Acetylcholine and dopamine

The thick myofilament is composed of (a)  

• MYOSIN
• ACTIN
• TROPONIN
• TROPOMYOSIN

A group of muscle fibers is called a (a)  

• FASCICLE
• TENDON
• LIGAMENT
• MYOFIBRIL

The CT sheath that surrounds an entire muscle is called (a)  

• EPIMYSIUM
• PERIMYSIUM
• ENDOMYSIUM
• FASCIA

The smallest unit of a muscle to contract is (a)  

• SARCOMERE
• MYOFIBRIL
• MYOSIN
• ACTIN

The type of tissue that connects muscle to bone is (a)  

• TENDON
• LIGAMENT
• CARTILAGE
• FASCIA

A muscle fiber is made of many (a)   (one unit down).

• MYOFIBRILS
• MYOCYTES
• MYOSIN
• ACTIN

A muscle is made of many (a)   (one unit down).

• FASCICLES
• CELLS
• FIBERS
• TISSUES