Muscle Types and Contractions Quiz

Which type of muscle is attached to bones and is responsible for voluntary control of movement and posture?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Connective tissue

Which muscle type is primarily found in the walls of hollow organs such as the stomach and intestines?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Connective tissue

What is the key difference in control between skeletal, cardiac, and smooth muscle?

• Skeletal is voluntary; cardiac and smooth are involuntary

• All are voluntary

• Cardiac is voluntary; skeletal and smooth are involuntary

• Smooth is voluntary; skeletal and cardiac are involuntary

Which protein is the primary component of the thick filaments in muscle fibers?

• Myosin

• Actin

• Troponin

• Tropomyosin

How do myosin heads contribute to muscle contraction?

• They pull the actin filaments inward, shortening the sarcomere

• They store and release calcium ions

• They conduct action potentials along the muscle fiber

• They form the Z disc of the sarcomere

What is the role of the motor neuron at the neuromuscular junction (NMJ)?

• It innervates muscle fibers, allowing them to contract

• It stores and releases calcium ions

• It forms the repeating functional units of muscle fibers

• It is the primary protein of thick filaments

What is the role of ATP during the power stroke phase of muscle contraction?

• It provides energy for myosin heads to pivot and pull actin filaments.

• It binds to troponin to expose myosin-binding sites.

• It causes the release of calcium from the SR.

• It breaks down glycogen into glucose.

Which protein does calcium bind to during muscle contraction to expose myosin-binding sites?

• Troponin

• Actin

• Myosin

• Tropomyosin

What is a common cause of muscle fatigue during high-intensity, short-duration activity?

• Lactic acid build-up

• Oxygen surplus

• Decreased ATP production

• Increased protein synthesis

A nerve cell that innervates muscle fibers and transmits impulses from the CNS to effect movement is called:

• Motor Neuron

• Sensory Neuron

• Interneuron

• Glial Cell