Pretest-posttest designs grew from the simpler posttest only designs, and address some of the issues arising with assignment bias and the allocation of participants to groups. One example is education, where researchers want to monitor the effect of a new teaching method upon groups of children.
The neuromuscular junction (NMJ) is the site of communication between motor nerve axons and muscle fibres.It is composed of four specialised cell types: motor neurons, Schwann cells, muscle fibres and the recently discovered kranocytes.he neuromuscular junction (NMJ) is the site of communication between motor nerve axons and muscle fibres.
A synapse between an axon and a muscle fibre is called neuromuscular junction. A synapse between an axon and a glandular cell is termed neuroglandular junction. Structure of these junctions and the transmission of nerve impulse across them are similar to those of neuron-neuron synapse. synapse between an axon and a muscle fibre is called neuromuscular junction. A synapse between an axon and a glandular cell is termed neuroglandular junction.... Nervous system transmits information as a series of nerve impulses. A nerve impulse, is the movement of an action potential as a wave through a nerve fibre.