Anatomy of a Sarcomere

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What is the main component of each thin filament?

Troponin

G-actin (correct)

Tropomyosin

Myomesin

In the A-band of the sarcomere, what maintains the arrangement of myosin filaments?

Myomesin (correct)

Actin

Tropomyosin

Troponin

What protein anchors the plus end of actin filaments at the Z-line in the sarcomere?

Myomesin

Troponin

Tropomyosin

Titin (correct)

Which area of the A-band contains only myosin filaments without overlapping with actin filaments?

H-zone Signup and view all the answers

What represents the functional unit of the myofibril where myosin and actin filaments interact during muscle contraction?

Sarcomere Signup and view all the answers

Where do two sets of actin filaments originate from in each sarcomere?

Z-lines Signup and view all the answers

What is the composition of myofibrils in cardiac muscle fibers?

Thick myosin filaments and three types of thin myofilaments Signup and view all the answers

What is the function of the lateral portions of intercalated disks in cardiac muscle fibers?

Rapid flow of ions between adjacent myocytes Signup and view all the answers

What is the primary function of the Transverse (T) tubule in muscle contraction?

Allowing propagation of electrical changes into the sarcoplasm Signup and view all the answers

Which components make up the predominant composition of thin myofilaments in cardiac muscle fibers?

Actin and tropomyosin Signup and view all the answers

What is the structural organization of myofibrils in cardiac muscle fibers?

A-bands aligned on the same level, with I-bands containing thin myofilaments Signup and view all the answers

Which structure is responsible for the release of stored Ca ions from the sarcoplasmic reticulum during muscle contraction?

Sarcoplasmic reticulum Signup and view all the answers

What is the role of fasciae adherentes in intercalated disks in cardiac muscle fibers?

Provide physical attachment and mechanical stability Signup and view all the answers

What percentage of intra cellular Calcium ions enter the sarcoplasm from the extracellular fluid through the T-tubules?

25% Signup and view all the answers

Which filament type is present in both A & I bands of myofibrils in cardiac muscle fibers?

Both thick myosin and thin myofilaments Signup and view all the answers

Which component is responsible for shortening of sarcomeres during muscle contraction?

Thick myosin filaments Signup and view all the answers

What is an essential function of the dilated terminal of the sarcoplasmic reticulum?

Facilitating Influx of Ca ions from the extracellular fluid Signup and view all the answers

Anatomy of a Sarcomere

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Questions and Answers

What is the main component of each thin filament?

In the A-band of the sarcomere, what maintains the arrangement of myosin filaments?

What protein anchors the plus end of actin filaments at the Z-line in the sarcomere?

Which area of the A-band contains only myosin filaments without overlapping with actin filaments?

What represents the functional unit of the myofibril where myosin and actin filaments interact during muscle contraction?

Where do two sets of actin filaments originate from in each sarcomere?

What is the composition of myofibrils in cardiac muscle fibers?

What is the function of the lateral portions of intercalated disks in cardiac muscle fibers?

What is the primary function of the Transverse (T) tubule in muscle contraction?

Which components make up the predominant composition of thin myofilaments in cardiac muscle fibers?

What is the structural organization of myofibrils in cardiac muscle fibers?

Which structure is responsible for the release of stored Ca ions from the sarcoplasmic reticulum during muscle contraction?

What is the role of fasciae adherentes in intercalated disks in cardiac muscle fibers?

What percentage of intra cellular Calcium ions enter the sarcoplasm from the extracellular fluid through the T-tubules?

Which filament type is present in both A & I bands of myofibrils in cardiac muscle fibers?

Which component is responsible for shortening of sarcomeres during muscle contraction?

What is an essential function of the dilated terminal of the sarcoplasmic reticulum?

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