LIFSCI 7C XL - Animation: Hierarchical
Organization of Muscle & Cross-Bridge
Cycle Latest Update Graded A+
What is the primary role of the muscle spindle in the body?
It detects changes in muscle length, helping regulate muscle contraction and maintain
muscle tone.
How does the spinal co...
LIFSCI 7C XL - Animation: Hierarchical
Organization of Muscle & Cross-Bridge
Cycle Latest Update Graded A+
What is the primary role of the muscle spindle in the body?
✔✔ It detects changes in muscle length, helping regulate muscle contraction and maintain
muscle tone.
How does the spinal cord contribute to reflex actions without involving the brain?
✔✔ It acts as the processing center for reflex arcs, allowing for quick responses to stimuli
without needing brain input.
Why is a monosynaptic reflex, such as the stretch reflex, faster than a polysynaptic reflex?
✔✔ It involves only one synapse between the sensory and motor neurons, reducing the time
needed for the signal to travel and elicit a response.
What is the significance of having inhibitory interneurons in reflex pathways?
✔✔ They prevent opposing muscles from contracting simultaneously, allowing for coordinated
movements by inhibiting the activity of antagonist muscles.
1
, How does the stretch reflex contribute to maintaining muscle tone?
✔✔ It provides continuous feedback to the muscles, ensuring that slight changes in muscle
length are corrected, which helps maintain posture and stability.
Why might an exaggerated reflex response suggest an issue in the central nervous system?
✔✔ It could indicate that the brain's inhibitory control over reflexes is compromised, often due
to damage to the upper motor neurons.
What would be the impact of damaged peripheral nerves on reflexes?
✔✔ Damaged peripheral nerves can disrupt the transmission of sensory and motor signals,
leading to weak or absent reflex responses.
How does the integration of sensory and motor signals in the spinal cord help protect the body
from harm?
✔✔ Reflexes allow the body to quickly respond to potentially harmful stimuli, like pulling away
from a hot surface, without waiting for the brain to process the information.
What role do proprioceptors play in complex motor coordination?
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