Muscular System Quiz

Compare these images of a relaxed skeletal muscle fiber and a fully contracted muscle fiber. Which would you see only in the relaxed fiber?

(Select Multiple)

• 1. Z. discs

• 1. Sarcomeres

• I bands

• A bands

• H zones

Answer explanation

After ACh attaches to its receptors at the neuromuscular junction, what is the next step?

• 1. Sodium channels open.

• 1. Calcium binds to regulatory proteins on the thin filaments.

• 1. Cross bridges attach.

• 1. ATP is hydrolyzed.

Your ability to lift that heavy couch would be increased by which type of exercise?

• Aerobic

• Endurance

• Resistance

• Swimming

Which of the following can lead to muscle fatigue?

(Select Multiple)

• Imbalances in ions

• Excessive amounts of oxygen

• Excessive amounts of ADP

• Oxygen deficit

Which are ways in which muscle names have been derived?

• 1. Attachments

• Size

• Function

• 1. Location

• All of these are correct.

Which of the following muscles attach to the hip bones?

(Select Multiple)

• Rectus abdominis

• Rectus femoris

• Vastus medialis

• Vastus lateralis

Which of these muscles is found on the posterior surface of the leg?

• Gastrocnemius

• Extensor digitorum longus

• Extensor carpi ulnaris

• Biceps femoris

Which of the following is (are) true concerning the pectoralis major?

(Select Multiple)

• 1. It raises the clavicle.

• 1. It adducts the humerus.

• 1. It abducts the arm.

• 1. It flexes the humerus.

Which of the following is (are) true concerning the pectoralis major?

(Select Multiple)

• 1. It raises the clavicle.

• 1. It adducts the humerus.

• 1. It abducts the arm.

• 1. It flexes the humerus.