Neuroscience of sex differences The adult human brain weighs on average about 1. Each hemisphere is divided into four main lobes although Terminologia Anatomica and Terminologia Neuroanatomica also include a limbic lobe and treat the insular cortex as a lobe.
Drugs, Brains, and Behavior: This three-pound mass of gray and white matter sits at the center of all human activity—you need it to drive a car, to enjoy a meal, to breathe, to create an artistic masterpiece, and to enjoy everyday activities. In short, your brain is you—everything you think and feel, and who you are.
How does the brain work? The brain is often likened to an incredibly complex and intricate computer. Instead of electrical circuits on the silicon chips that control our electronic devices, the brain consists of billions of cells, called neurons, which are organized into circuits and networks.
Each neuron acts as a switch controlling the flow of information. If a neuron receives enough signals from other neurons connected to it, it "fires," sending its own signal on to other neurons in the circuit. The brain is made up of many parts with interconnected circuits that all work together as a team.
Different brain circuits are responsible for coordinating and performing specific functions. Networks of neurons send signals back and forth to each other and among different parts of the brain, the spinal cord, and nerves in the rest of the body the peripheral nervous system.
To send a message, a neuron releases a neurotransmitter into the gap or synapse between it and the next cell. The neurotransmitter crosses the synapse and attaches to receptors on the receiving neuron, like a key into a lock.
This causes changes in the receiving cell. Other molecules called transporters recycle neurotransmitters that is, bring them back into the neuron that released themthereby limiting or shutting off the signal between neurons.
How do drugs work in the brain? Drugs interfere with the way neurons send, receive, and process signals via neurotransmitters.
Some drugs, such as marijuana and heroin, can activate neurons because their chemical structure mimics that of a natural neurotransmitter in the body.
This allows the drugs to attach onto and activate the neurons.
Other drugs, such as amphetamine or cocaine, can cause the neurons to release abnormally large amounts of natural neurotransmitters or prevent the normal recycling of these brain chemicals by interfering with transporters. This too amplifies or disrupts the normal communication between neurons.
What parts of the brain are affected by drug use? Drugs can alter important brain areas that are necessary for life-sustaining functions and can drive the compulsive drug use that marks addiction.
Brain areas affected by drug use include:WebMD's Brain Anatomy Page provides a detailed diagram and definition of the brain including its function, parts, and conditions that affect it.
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Introducing the Human Brain The human brain is the most complex organ in the body. This three-pound mass of gray and white matter sits at the center of all human activity—you need it to drive a car, to enjoy a meal, to breathe, to create an artistic masterpiece, and to enjoy everyday activities.
The brain regulates your body's basic functions. WebMD's Brain Anatomy Page provides a detailed diagram and definition of the brain including its function, parts, and conditions that affect it.
You Have Some Nerve! So the brain is boss, but it can't do it alone. It needs some nerves — actually a lot of them. And it needs the spinal cord, which is a long bundle of nerves inside your spinal column, the vertebrae that protect it. The human brain is the central organ of the human nervous system, and with the spinal cord makes up the central nervous caninariojana.com brain consists of the cerebrum, the brainstem and the caninariojana.com controls most of the activities of the body, processing, integrating, and coordinating the information it receives from the sense organs, and .