Muscular System Quiz

Which of the following is the basic structural unit of a muscle?

• Myofibril

• Sarcomere

• Muscle fiber

• Fascicle

Which type of muscle tissue is found in the walls of hollow organs?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Striated muscle

What is the role of calcium ions in muscle contraction?

• They bind to actin filaments

• They bind to troponin, causing a conformational change

• They provide energy for the contraction

• They break down ATP

Which of the following is NOT a type of muscle tissue?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Connective muscle

What is the primary cause of muscle fatigue?

• Lack of oxygen

• Accumulation of lactic acid

• Depletion of glycogen

• All of the above

Which protein is responsible for the power stroke in muscle contraction?

• Actin

• Myosin

• Troponin

• Tropomyosin

What is the function of the sarcoplasmic reticulum in muscle cells?

• To store and release calcium ions

• To generate ATP

• To transmit nerve impulses

• To synthesize proteins

Which type of muscle tissue is under voluntary control?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• None of the above

During muscle contraction, which bands of the sarcomere shorten?

• A bands

• I bands

• H zones

• Both B and C

What is the role of ATP in muscle contraction?

• It binds to actin

• It binds to myosin, allowing it to detach from actin

• It binds to troponin

• It binds to tropomyosin