As well as these main digestive system organs, you also have some additional organs, known as accessory organs. (probiotics-help.com)
The nervous system has a direct effect on the immune system due to the nerve supply to the important immune system organs. (truehealthct.com)
Under the current opt - in system, individuals must actively choose to join the organ donor register, whereas with a soft opt - out system organ donation is the default position, but relatives are asked if they are aware of any unregistered objection to the individual donating their organs. (politics.co.uk)