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Questions and Answers
What is the role of Golgi tendon organs in skeletal muscles?
What is the role of Golgi tendon organs in skeletal muscles?
- Stabilizing actin-myosin crossbridges in the absence of ATP
- Sensory receptors providing data to the central nervous system (correct)
- Supplying ATP to muscle fibers during activity
- Initiating muscle contraction at the neuromuscular junction
What occurs in skeletal muscles when mitochondrial activity stops after death?
What occurs in skeletal muscles when mitochondrial activity stops after death?
- Increased myelination of motor nerves
- Rigor mortis due to stable actin-myosin crossbridges (correct)
- Enhanced ATP production by mitochondria
- Decreased muscle rigidity
Where do myelinated motor nerves branch out within skeletal muscles?
Where do myelinated motor nerves branch out within skeletal muscles?
- Sarcoplasmic reticulum
- Perimysium (correct)
- Endomysium
- Epimysium
What is the structure where the terminal branches of motor axons make contact with muscle fibers?
What is the structure where the terminal branches of motor axons make contact with muscle fibers?
What covers the terminal portion of the axon at the neuromuscular junction?
What covers the terminal portion of the axon at the neuromuscular junction?
What type of neurons originate in the spinal cord or brainstem to innervate skeletal muscle fibers?
What type of neurons originate in the spinal cord or brainstem to innervate skeletal muscle fibers?
Where do unmyelinated terminal twigs from motor nerves form synapses with individual muscle fibers?
Where do unmyelinated terminal twigs from motor nerves form synapses with individual muscle fibers?
What do proprioceptors in striated muscles serve as?
What do proprioceptors in striated muscles serve as?
In rigor mortis, what accounts for the rigidity of skeletal muscles?
In rigor mortis, what accounts for the rigidity of skeletal muscles?
What do motor axons terminate on at the neuromuscular junction?
What do motor axons terminate on at the neuromuscular junction?
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