Chapter 6: The Muscular System

The type of muscle found attached to bones is ________ and it is ________ (voluntary/involuntary).

• skeletal, voluntary

• cardiac, involuntary

• smooth, involuntary

• skeletal, involuntary

The type of muscle found in the walls of hollow organs is:

• Skeletal muscle, voluntary

• Cardiac muscle, involuntary

• Smooth muscle, involuntary

• Skeletal muscle, involuntary

Which muscle type is found only in the heart? Is this type of muscle voluntary or involuntary?

• Skeletal muscle, voluntary

• Smooth muscle, involuntary

• Cardiac muscle, involuntary

• Cardiac muscle, voluntary

Which of the following are functions of muscles?

• Movement, posture maintenance, heat production, joint stabilization

• Digestion, circulation, respiration, excretion

• Vision, hearing, taste, smell

• Cognition, emotion, memory, learning

The smallest functional unit of a muscle fiber is called a:

• Sarcomere

• Myofibril

• Muscle cell

• Actin

The thin myofilaments are called:

• Actin

• Myosin

• Tropomyosin

• Troponin

The fibrous tissue that separates each muscle from another is called:

• Fascia

• Tendon

• Ligament

• Cartilage

What mineral is needed for the active site on actin to be exposed?

• Calcium

• Magnesium

• Potassium

• Sodium

The thick myofilaments are called:

• Actin

• Myosin

• Tropomyosin

• Troponin

What is “Step 1” of a muscle contraction?

• The release of calcium ions from the sarcoplasmic reticulum

• The binding of ATP to the myosin head

• The detachment of myosin from actin

• The hydrolysis of ATP to ADP and inorganic phosphate