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Introduction to Muscular System and Muscle Physiology

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Introduction to Muscular System and Muscle Physiology

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Questions and Answers

What is the function of Troponin I in muscle contraction?

Binds other troponin molecules to tropomyosin

Inhibits the interaction of actin with myosin (correct)

Assists in rapid transmission of action potential

Forms the backbone of F-actin

What is the main function of the sarcotubular system?

Facilitates rapid transmission of action potential (correct)

Stores calcium ions

Secrete neurotransmitters

Initiates action potential

What is the composition of the actin filament?

Actin, troponin, and tropomyosin (correct)

Actin, myosin, and tropomyosin

Actin, troponin, and myosin

Actin and myosin only

What is the arrangement of myofibrils in skeletal muscles called?

Sarcomere Signup and view all the answers

What is the structure responsible for ATP production needed for muscle contraction?

Mitochondria Signup and view all the answers

What type of muscles contain pacemaker cells and contract rhythmically involuntarily in the heart?

Cardiac Muscles Signup and view all the answers

What is the function of the sarcolemma in a muscle fiber?

To attach to the tendon fibers Signup and view all the answers

Which type of muscle lacks cross-striations?

Smooth Muscles Signup and view all the answers

What are the building blocks of the muscular system?

Skeletal Muscle Fibers Signup and view all the answers

How many actin filaments are present in each myofibril?

~3000 Signup and view all the answers