PSL300H1 Study Guide - Quiz Guide: Gamma Motor Neuron, Olfactory Receptor Neuron, Substantia Gelatinosa Of Rolando
Document Summary
Which factor will decrease the activity of muscle spindle afferents? (answer: a: contraction of extrafusal muscle fibers, passive stretch of the muscle, contraction of intrafusal muscle fibers, activation of gamma-motoneurons, contraction of the antagonist muscle. Which one is not correct: sympathetic: cutaneous vasoconstriction, parasympathetic: reduction in cardiac output, sympathetic: piloerection, parasympathetic: shivering, neuroendocrine: reduction of antidiuretic hormone release in posterior pituitary. At low levels of synaptic input to a motor nucleus in the spinal cord, the very first neurons to be "recruited " would probably be: large alpha motoneurons gamma motoneurons small alpha motoneurons. The pulling of actin filaments towards the center of sarcomeres during muscle contraction is directly powered by: hydrolysis of atp to adp + pi and release of the high energy bond. "elastic" restoring forces in the myosin head or crossbridge creatine kinase hydrolysis of creatine phosphate.
