What does internal/external mean?

What does external and internal envrioment mean in neuroscience?

• im currently learning about it but Its in a book so yeah

• Answer:

  External environment is the world we live in that influence our brain. Internal environment is something within yourself that influences the brain such as your hormones, genes, or metabolism. Here's a really good article you can read up more on: http://www.nature.com/scitable/topicpage/environmental-influences-on-gene-expression-536 Here're more good reading materials: http://www.pennmedicine.org/health_info/body_guide/reftext/html/nerv_sys_fin.html http://leavingbio.net/THE%20NERVOUS%20SYSTEM_files/THE%20NERVOUS%20SYSTEM.htm "The nervous system allows the animal to quickly detect, communicate and co-ordinate information about its external and internal environment so it can make efficient appropriate responses for survival and/or reproduction. The two major parts of our nervous system are the central nervous system (CNS) and peripheral nervous system (PNS). The CNS is made of the brain and spinal cord. The cranial nerves, spinal nerves and ganglia make up the PNS. The cranial nerves connect to the brain. The cranial and spinal nerves contain the axons (fibres) of sensory and motor nerve cells. Nerve cells areas are also known as neurons. Neurons are the basic unit of the nervous system. They carry information or impulses as electrical signals from one place to another in the body. There are 3 types of neurons: Sensory Neurons- Sensory neurons carry electrical signals (impulses) from receptors or sense organs to the CNS. Sensory neurons are also called afferent neurons. The cell body of sensory neurons is outside the CNS in ganglia. Motor Neurons- Motor neurons carry impulses from the CNS to effector organs Motor neurons are also called efferent neurons. The cell bodies of motor neurons are inside the CNS. Interneurons- These are also called intermediate, relay, or associative neurons. They carry information between sensory and motor neurons. They are found in the CNS."