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BMSC207- Module 8 Test with Questions and 100% Correct Answers
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BMSC207- Module 8 Test with Questionsand 100% Correct Answers
what may myosatellite cells involved in muscle repair form? - Answer new muscle fibres
(this occurs in development)
what do satellite cells do in response to an injury? - Answer - satellite cells become
activated and proliferate
- satellite cells will migrate to the damaged region and, depending on the severity of the
injury, fuse to the existing muscle fibre to cause regeneration
what is muscle hypertrophy? - Answer when skeletal muscle is subjected to an overload
stimulus, it causes perturbations in muscle fibres and the related extracellular matrix
what can muscle hypertrophy ultimately lead too? - Answer - increase in size and
number of contractile proteins (myosin and actin)
- increase number of sarcomeres within a muscle length, increased myofibrils
- increased sarcoplasmic storage (glycogen)
what type of fiber is there a greater rate of myofiber hypertrophy - Answer
how can skeletal muscle atrophy occur? - Answer can occur due to
disuse (immobilization, bed rest, unloading)
what is cachexia? - Answer weakness and/or wasting due to chronic disease
, what happens in skeletal muscle reflexes? - Answer receptors sense changes in
joint movements, muscle tension and muscle length and feed info into the CNS
what two ways do CNS respond to skeletal muscle reflexes? - Answer - if muscle
contraction is needed the CNS activates motor neurons to the muscle fibres
- if relaxation is needed sensory input activates inhibitory interneurons in CNS
which inhibit activity in motor neuron leading to relaxation
True or False. skeletal muscle reflexes are involved in almost all movements. - Answer
True
what are the four components of skeletal reflexes? - Answer - sensory receptor
- integrating center
- efferent neurons
- effectors
what is a monosynaptic reflex? - Answer has a single synapse between the afferent
and efferent neurons
what is a polysynaptic reflex? - Answer - have two or more synapses
- this somatic motor reflex has both synapses in the CNS
what are proprioceptors? - Answer provide information into the CNS about the
position of our limbs in space, movements, and the effort exerted by skeletal muscle
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