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Sarcomere Structure & Muscle Contraction MD2002 Learning Outcomes Quiz

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Sarcomere Structure & Muscle Contraction MD2002 Learning Outcomes Quiz

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Questions and Answers

What is the main role of titin in the sarcomere?

Generates ATP for muscle contraction

Anchors actin to the Z-disc (correct)

Facilitates calcium binding to actin

Regulates myosin-actin interaction

Which protein is critical for the regulation of calcium release from the sarcoplasmic reticulum during muscle contraction?

Dystrophin

Troponin (correct)

Tropomyosin

Nebulin

What is the function of 'T-tubules' in muscle cells?

Conduction of action potentials deep into the muscle cell (correct)

Anchoring myosin to the Z-disc

Generation of ATP for energy production

Storage of calcium ions for muscle contraction

Which process describes the transfer of a signal from a motor neuron to a muscle cell?

Neuromuscular innervation (A) Signup and view all the answers

What is the primary function of the sarcoplasmic reticulum in muscle cells?

Storage and release of calcium ions for muscle contraction (D) Signup and view all the answers

Which protein is responsible for tethering actin to the Z-disc and maintaining sarcomere structure?

α-Actinin (A) Signup and view all the answers

What is the role of tropomyosin in muscle contraction?

Prevents myosin binding to actin in the relaxed state (B) Signup and view all the answers

What protein binds to actin, tropomyosin, and calcium in muscle cells?

Troponin (D) Signup and view all the answers

Which structure stores calcium ions in muscle cells and releases them upon stimulation?

Endoplasmic reticulum (A) Signup and view all the answers

What is the primary function of T-tubules in muscle cells?

Transmits electrical impulses deep into the cell (B) Signup and view all the answers

Which molecule is responsible for breaking down acetylcholine at the neuromuscular junction?

Acetylcholinesterase (D) Signup and view all the answers

What process occurs when calcium binds to TnC in muscle cells?

Conformational changes in troponin occur (D) Signup and view all the answers

Which protein is responsible for regulating the ATPase activity of myosin?

Myosin regulatory light chain (MLC-2) (A) Signup and view all the answers

What causes sarcomeres to shorten and muscles to contract in the presence of ATP?

Myosin binding to actin (B) Signup and view all the answers