ANAT 1009 TEST 2

Which structure anchors the thin filaments within a sarcomere?

• A. Z line

• B. M line

• C. H zone

• D. A band

Which of the following are required for cross-bridge cycling?

• ATP binding

• Calcium binding to troponin

• Actin–myosin interaction

• Troponin degradation

Which of the following accurately describes the sarcomere during contraction?

• A. A band shortens

• B. I band shortens

• C. H zone lengthens

• D. Z discs separate

Which structure carries the action potential deep into the muscle fiber?

• T-tubules

• Sarcolemma

• Sarcoplasmic reticulum

• Mitochondria

Which of the following muscles is primarily involved in elbow flexion?

• Triceps brachii

• Deltoid

• Biceps brachii

• Supraspinatus

Which of the following best describes isometric contraction?

• Muscle length shortens

• Muscle length stays the same but tension develops

• Tension decreases

• Sarcomeres lengthen

Which of the following is a primary muscle for plantar flexion?

• Tibialis anterior

• Soleus

• Sartorius

• Hamstrings

Which muscle group is located on the posterior thigh?

• Quadriceps femoris

• Hamstrings

• Adductor group

• Gluteal group

Which of the following occurs during the power stroke?

• Myosin head pivots and pulls actin inward

• ATP binds to actin

• Calcium is pumped out of the cell

• Tropomyosin blocks binding sites

Which structure is the site of neurotransmitter release in skeletal muscle?

• Neuromuscular junction

• Sarcolemma

• Myofibril

• Myofilament