These are the brain, heart, kidneys, liver, and lungs. The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones.
For the beetle genus, see Coprini. 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.
In prophase II of meiosis, the following events occur: 1  The nuclear membrane and nuclei break up while the spindle network appears.â. 2  Chromosomes do not replicate any further in this phase of meiosis.â. 3  The chromosomes begin migrating to the metaphase II plate (at the cell's equator).