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.
Figure 2.2: Neurons transmit information to other neurons. Information passes from the axon of the presynaptic neuron to the dendrites of the postsynaptic neuron. Figure 2.3: The synapse is the site where chemical signals pass between neurons.he neuron has processes called dendrites that receive signals and an axon that transmits signals to another neuron. The cell body, also called the soma, is the metabolic center of the neuron. The nucleus is located in the cell body, and most of the cellâs protein synthesis occurs in the cell body.