Muscular System Review

Which of the following is NOT a function of the muscular system?

• Producing movement

• Maintaining posture

• Generating heat

• Producing red blood cells

What property allows muscles to stretch without being damaged?

• Contractility

• Excitability

• Extensibility

• Elasticity

Which muscle type is both involuntary and striated?

• Skeletal

• Smooth

• Cardiac

• All of the above

What neurotransmitter is released at the neuromuscular junction to trigger muscle contraction?

• Dopamine

• Acetylcholine (ACh)

• Serotonin

• Epinephrine

What ion binds to troponin to initiate muscle contraction?

• Calcium

• Sodium

• Potassium

• Magnesium

Which ion is essential for muscle contraction?

• Sodium (Na⁺)

• Calcium (Ca²⁺)

• Potassium (K⁺)

• Magnesium (Mg²⁺)

The muscle attachment to a stationary bone is called the:

• A) Insertion

• B) Prime mover

• C) Origin

• D) Antagonist

What is required to detach myosin heads from actin during muscle contraction?

• Calcium

• ATP

• Oxygen

• Lactic Acid

What causes muscle fatigue and soreness during intense exercise?

• Oxygen surplus

• Lactic acid buildup

• ATP overproduction

• Excess calcium

Which of the following is located in the posterior part of the body?

• Pectoralis major

• Rectus abdominis

• Gastrocnemius

• Quadriceps