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Questions and Answers
Which structures are found in the sarcoplasm of a muscle fiber?
Which structures are found in the sarcoplasm of a muscle fiber?
- Longitudinal and transverse tubules
- I bands and A bands
- Myofibrils and Z-lines (correct)
- Mitochondria and Golgi apparatus
What is the unit of myofibril called?
What is the unit of myofibril called?
- Sarcolemma
- Sarcoplasm
- Sarcomere (correct)
- Z-line
What is the function of transverse tubules in a muscle fiber?
What is the function of transverse tubules in a muscle fiber?
- To store calcium ions
- To generate force during contraction
- To transmit action potentials (correct)
- To provide energy for muscle contraction
What is the name of the band that bisects the A band in a myofibril?
What is the name of the band that bisects the A band in a myofibril?
What is the shape of a muscle fiber?
What is the shape of a muscle fiber?
Which of the following is NOT found in the sarcoplasm of a muscle fiber?
Which of the following is NOT found in the sarcoplasm of a muscle fiber?
What is the function of longitudinal tubules in a muscle fiber?
What is the function of longitudinal tubules in a muscle fiber?
What is the role of the Z-line in a myofibril?
What is the role of the Z-line in a myofibril?
What is the H band in a myofibril composed of?
What is the H band in a myofibril composed of?
What are the two types of myofilaments found in a myofibril?
What are the two types of myofilaments found in a myofibril?
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Study Notes
Muscle Fiber Structure
- The sarcoplasm of a muscle fiber contains myofibrils, mitochondria, sarcoplasmic reticulum, and transverse tubules.
Myofibril Structure
- A unit of myofibril is called a sarcomere.
- The M line bisects the A band in a myofibril.
Muscle Fiber Shape
- Muscle fibers are long, multinucleated, and cylindrical in shape.
Transverse Tubules
- Transverse tubules (T-tubules) are involved in the transmission of action potentials from the muscle fiber surface to the sarcoplasmic reticulum.
Longitudinal Tubules
- Longitudinal tubules are not found in muscle fibers; instead, smooth endoplasmic reticulum is present.
Z-line Function
- The Z-line marks the boundary of a sarcomere and acts as an anchor for the myofilaments.
H Band Composition
- The H band is composed of thick myofilaments (myosin).
Myofilaments
- There are two types of myofilaments found in a myofibril: thick myofilaments (myosin) and thin myofilaments (actin).
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