Stimulation of a muscle fiber by a motor neuron occurs at:
Correct answer: A. The neuromuscular junction
- A. The neuromuscular junction
- B. The transverse tubules
- C. The myofibril
- D. The sacroplasmic reticulum.
Explanation
A neuron that transmits a stimulus to muscle tissue is called motor neuron. A motor unit consists of a single motor neuron (nerve cell) and the muscle fibres it innervates. The portion of the muscle plasma membrane (sarcolemma) that lies beneath the nerve endings (axon terminals) is called the motor end plate. The axon terminals and the motor end plate together constitute the neuromuscular junction or neuromotor junction. B. Sarcolemma of muscle fibre penetrates deep into the cell to form a hollow elongated tube called transverse tubule.C. Muscle fibres of skeletal muscles are composed of myofibrils which are further of two types thick and thin myofibrils.D. Endoplasmic reticulum of muscles is called sarcoplasmic reticulum.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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