Aetna CEO: Obamacare In A 'Death Spiral' Heading Into 2018. Aetna and Humana have called off their deal amid government concerns over competition. Here's a look back at six pivotal moments that led to this. Aetna and Humana have called off their deal amid government concerns over competition.
For the plant genus, see Synapsis (plant). Synapsis (also called syndesis) is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis.
This essay has been submitted by a student. This is not an example of the work written by our professional essay writers. A synapse happens when the electrical activity in the pre-synaptic neuron influences the post-synaptic neuron. There are two types of synapses in the body, the electrical (gap junctions) and chemical. Electrical synapses occur in pre and post synaptic neurons that are joined via gap junctions.