Anatomy The Muscular System

Which type of muscle is NOT striated?

• Skeletal

• Cardiac

• Smooth

What is a natural byproduct of muscle cell metabolism?

• ATP

• Synthesis

• Protein

• Heat

What are the individual muscle fibers (cells) that are arranged in bundles called?

• Epimysium

• Perimysium

• Endomysium

• Fascicles

What keeps the body in position giving a steady partial contraction of muscle?

• Muscle rigidity

• Muscle flaccidity

• Muscle tone

• Muscle posture

What is a band of dense regular connective tissue that attaches muscle to bone called?

• Tendons

• Perimysium

• Epimysium

• Ligaments

What is the name of muscle fibers capacity to undergo shortening and become thicker ?

• Synapse

• Membrane potential

• Contractility

• Excitability

What are the two kinds of skeletal muscle fiber made primarily of protein?

• Actin, Myosin

• Acetylcholine, Myosin

• Synapse, Actin

• Sarcomere, Actin

In addition to ATP, actin and myosin what else is needed for muscle contraction (this enables actin and myosin to cross bridges)?

• Protein

• Acetylcholine

• Phosphorus

• Calcium

What two proteins block the site on actin filaments where cross-bridges form (This occurs when muscles are at rest)?

• ADP, ATP

• Sarcoplasmic reticulum (SR), Acetylcholine

• Troponin, tropomyosin

What in muscle cells stores oxygen?

• Glycogen

• Myolglobin

• Hemoglobin

• Fatty acids