The cell membrane of a muscle cell is:
Correct answer: B. Sarcolemma
- A. Sarcoplasm
- B. Sarcolemma
- C. Sarcomere
- D. Myofibrils
Explanation
The sarcolemma is the specialized cell membrane of muscle cells, also known as muscle fibers. It surrounds and encapsulates the muscle cell, playing a crucial role in the excitation-contraction coupling process, which is essential for muscle contraction. Sarcomere (Option C) is the basic structural and functional unit of a muscle fiber, while sarcoplasm (Option A) refers to the cytoplasm of a muscle cell. Myofibrils (Option D) are long, thread-like structures within muscle cells that contain the contractile proteins responsible for muscle contraction.
Last updated
About Muscles
Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
Practise Support and Movement
738 free Support and Movement MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A muscle of fascicle is a:
A muscle with characters like a spontaneous contraction, one nucleus per cell, and no control over contraction is most likely:
Cardiac muscles of frog are identified under the microscope by the presence of
Diaphragm is a sheet of:
Each muscle fiber is surrounded by a modified cell membrane called: