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MBChB Muscle Characteristics

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Questions and Answers

What is the primary function of Titin in muscle contraction?

To bind to actin filaments

To act as a molecular motor

To act as a molecular spring (correct)

To generate force during contraction

What is the term for the ability of muscles to respond to chemical signals, stretch, or other signals?

Responsiveness (correct)

Contractility

Conductivity

Elasticity

What is the purpose of T-tubules in muscle fibers?

To help propagate action potentials (correct)

To maintain the structure of myofibrils

To store glycogen for energy production

To regulate muscle contraction

What is the term for the group of muscle fibers innervated by a single motor neuron?

Motor unit (D) Signup and view all the answers

What is the primary component of thick filaments in muscle myofibrils?

Myosin (B) Signup and view all the answers

What is the function of Nebulin in muscle structure?

To act as a molecular ruler (A) Signup and view all the answers

What is the primary function of Troponin C in muscle contraction?

Binds to Ca2+ (B) Signup and view all the answers

What is the role of the neuromuscular junction in muscle contraction?

Initiates muscle contraction (B) Signup and view all the answers

What is the composition of a motor unit?

One motor neuron and multiple muscle fibers of the same type (B) Signup and view all the answers

What is the result of the binding of Acetylcholine to its receptor on the muscle fiber?

Entry of Na+ into the sarcoplasm (D) Signup and view all the answers

What is required for muscle contraction to occur?

Nerve impulse only (B) Signup and view all the answers

What is the function of Acetylcholinesterase in neuromuscular transmission?

Degradates Acetylcholine (B) Signup and view all the answers

What is the primary function of skeletal muscles in maintaining body posture?

Maintaining standing position and body position (D) Signup and view all the answers

What is the term for the process by which a motor neuron stimulates muscle contraction?

Neuromuscular transmission (B) Signup and view all the answers

What is the basic functional unit of skeletal muscle contraction?

Motor unit (C) Signup and view all the answers

What is the term for the repeating unit of muscle contraction?

Sarcomere (A) Signup and view all the answers

What is the name of the structure that contains the contractile units of muscle cells?

Myofibril (D) Signup and view all the answers

What is the process by which skeletal muscles regulate body temperature?

Muscle contraction (A) Signup and view all the answers