Psychology & Psychiatry

Why do we get teary when we're tired or sick?

It's been a big week and you feel exhausted, and suddenly you find yourself crying at a nice nappy commercial. Or maybe you are struck with a cold or the coronavirus and the fact your partner used up all the milk just makes ...

Alzheimer's disease & dementia

Risk factors for dementia may vary with age, finds study

Which vascular risk factors are associated with the risk of developing dementia may vary with age. A new study shows that among people around age 55, the risk of developing dementia over the next 10 years was increased in ...

Genetics

Study offers new insights on gene activity and addiction

Researchers at North Carolina State University have demonstrated that neuron-like cells derived from human stem cells can serve as a model for studying changes in the nervous system associated with addiction. The work sheds ...

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Nervous system

The nervous system is a network of specialized cells that communicate information about an organism's surroundings and itself. It processes this information and causes reactions in other parts of the body. It is composed of neurons and other specialized cells called glial cells,(plural form glia), that aid in the function of the neurons. The nervous system is divided broadly into two categories: the peripheral nervous system and the central nervous system. Neurons generate and conduct impulses between and within the two systems. The peripheral nervous system is composed of sensory neurons and the neurons that connect them to the nerve cord, spinal cord and brain, which make up the central nervous system. In response to stimuli, sensory neurons generate and propagate signals to the central nervous system which then processes and conducts signals back to the muscles and glands. The neurons of the nervous systems of animals are interconnected in complex arrangements and use electrochemical signals and neurotransmitters to transmit impulses from one neuron to the next. The interaction of the different neurons form neural circuits regulate an organism's perception of the world and what is going on with its body, thus regulating its behavior. Nervous systems are found in many multicellular animals but differ greatly in complexity between species.

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