FOHP 111

What type of muscle is responsible for voluntary movements and is typically attached to bones?

• SKELETAL MUSCLE

• CARDIAC MUSCLE

• SMOOTH MUSCLE

What is the basic functional unit of a muscle fiber called?

• SARCOMERE

• AXON

• SOMA

• NUCLEUS

What molecule provides the immediate source of energy for muscle contraction?

• ATP

• AcH

• NE

What is the neurotransmitter responsible for transmitting signals from motor neurons to muscle fibers at the neuromuscular junction?

• ATP

• AcH

• NE

During muscle contraction what ions cause the binding of myosin to actin filaments?

• Ca ion

• Na ion

• K ion

• Cl ion

What molecule binds to troponin during muscle contraction, exposing the myosin-binding sites on actin filaments?

• Ca ion

• Na ion

• K ion

• Cl ion

What is the term for the inability of a muscle to maintain a constant force of contraction over time when stimulated repeatedly?

• muscle fatigue

• tetanus

• summation

What is the term for the increase in muscle size that occurs in response to resistance training or exercise?

• atrophy

• hypertrophy

• swelling

It stores and releases calcium ions (Ca2+) required for muscle contraction.

• sarcoplasmic reticulum

• actin

• myosin

• sarcomere

What is the process called when a muscle lengthens while still under tension, as seen in activities like lowering a weight during a bicep curl?

• Eccentric contraction

• Concentric contraction

• Stretching