which of the following is true regarding nuclear bag fibres of motorunit ?
Two types of intrafusal fibres -- nuclear bag fibre * primary (la) afferent -- supplies annulospiral ending in the centre -- provide information on muscle length and velocity (phasic response) fast stretch reflex -- nuclear chain fibre * primary (la) and secondary (II) afferent -- supplies flower spray ending -- monitor the length of the muscle (tonic response) --slow stretch reflex ref : guyton and hall
responds to length only
responds to both length and velocity changes
responds to contraction of muscle fibres
responds to reflex relaxation
All India exam