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Muscular Tissue and Muscle Fibers

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Questions and Answers

What is the function of glycogen granules and lipid droplets in the sarcoplasm?

To synthesize proteins for the muscle

To provide structural support to the myofibril

To serve as energy sources (correct)

To regulate the contraction of the muscle

What is the function of the M-line in the sarcomere?

To connect the thick filaments together in a transverse direction (correct)

To regulate the contraction of the muscle

To provide structural support to the myofibril

To anchor the thin filaments to the z-line

What is the characteristic of cardiac muscle fibers?

They are striated and voluntary

They are striated and involuntary (correct)

They are smooth and involuntary

They are smooth and voluntary

What is the length of the sarcomere?

2-3 um (C) Signup and view all the answers

What is the function of the sarcoplasmic reticulum?

To store and release calcium ions for muscle contraction (B) Signup and view all the answers

What is the characteristic of the sarcoplasmic reticulum in cardiac muscle cells?

It is less abundant and runs the whole length of the sarcomeres without fenestrated cisternae at the H-band (D) Signup and view all the answers

What is the shape of the nucleus in smooth muscle fibers?

Spiral (A) Signup and view all the answers

What is the function of the intercalated discs in cardiac muscle cells?

To facilitate the transmission of electrical signals between cells (C) Signup and view all the answers

What is the characteristic of the transverse tubules in cardiac muscle cells?

They run at the level of the Z-line (A) Signup and view all the answers

What is the significance of the caveolae in smooth muscle fibers?

They facilitate the contact between the sarcolemma and the SER cisternae (A) Signup and view all the answers

What is the characteristic of the nuclei in skeletal muscle fibers?

Elongated and peripheral (B) Signup and view all the answers

What type of connective tissue surrounds the whole muscle?

Epimysium (A) Signup and view all the answers

What is the characteristic of the cytoplasm in skeletal muscle fibers?

Acidophilic and shows transverse striations (A) Signup and view all the answers

What is the function of the elaborate membrane system around myofibrils in skeletal muscle fibers?

Smooth endoplasmic reticulum (B) Signup and view all the answers

What is the shape of the skeletal muscle fibers in transverse section?

Polygonal and rounded (A) Signup and view all the answers