Muscular System lecture and texbook content quiz

Which type of muscle have striations?

• Cardiac muscle

• Smooth muscle

• Striated muscle

Answer explanation

striation (aka Z-lines) are seen in both cardiac and striated cells... they just differ in organization and numbers per cells

According to the material, what is the difference between the origin and insertion of a muscle?

• The origin moves during contraction, the insertion does not

• The insertion moves during contraction, the origin does not

• Both move during contraction

• Neither moves during contraction

Which of the following muscles is responsible for allowing us to pucker our mouths?

• Orbicularis oris

• Triceps brachii

• Rectus femoris

• Latissimus dorsi

In the context of muscle movement, what is the role of the antagonist muscle?

• To relax and allow the agonist muscle to contract

• To contract and initiate movement

• To attach to the skin only

• To produce hormones

What is the name of the units that make up a muscle, each covered by the perimysium?

• Fascicles

• Myofibrils

• Tendons

• Sarcomeres

Which two proteins are the major components of a sarcomere?

• Actin and myosin

• Collagen and elastin

• Keratin and titin

• Myoglobin and hemoglobin

Which of the following is NOT a symptom of muscular dystrophy in dogs?

• Increased agility and exercise tolerance

• Loss of muscle mass

• Regurgitation due to megaesophagus

• Abnormally large tongues

Tags

NGSS.MS-LS3-1

Which gene is most commonly associated with muscular dystrophy in dogs?

• Dystrophin

• Hemoglobin

• Myosin

• Actin

Tags

NGSS.HS-LS3-2

Why are males more likely to show signs of muscular dystrophy caused by Dystrophin mutations?

• They have only one X chromosome

• They have stronger muscles

• They have two X chromosomes

• They have more Dystrophin

What happens to the sarcolemma in patients with mutated Dystrophin?

• It becomes unstable and often ruptures

• It thickens and becomes stronger

• It produces more Dystrophin

• It repairs itself quickly