Muscles

[rosebud]

Q. Outline the sequence of events that occurs between the stretching of muscle spindles and the increased contraction of the brachialis muscle.

(8 marks)

[canalon]

Do your homework!

marks:0

[rosebud]

I'm not asking for an answer. I just want some ideas that I could include. I already have a rough idea of what to put.

[canalon]

Not that it is exactly clear from your question, he!

What ideas do you have? There will probably be plenty of people to complete any missing step.

[rosebud]

: Muscle spindles are specialised fibres and they act as receptors to the amount of stretch in a muscle.
: As they become stretched , spindles send impulses via sensory neurones to the spinal cord.
: These synapse with motor neurones that lead back to the muscles (effectors)
: At the muscles these impulses cause the brachialis muscle to contract and other muscles to relax.

: Muscle spindle reflex- one muscle contracts and the other relaxes
: The relaxed muscle is stretched and the muscle spindle is stimulated.

: Muscle spindle reflex- stretched muscle contracts and the other relaxes
: Relaxed muscle is stretched and its muscle spindle stimulated