Free Bihar Police SI Prelims 2020: Full Mock Test 100 Questions 200 Marks 120 Mins Latest Bihar Police SI Updates Last updated on Sep 22, 2022 Bihar Police Sub-Ordinate Service Commission (BPSSC) has activated the link to download the mark sheet of Bihar Police Sub Inspector on 21st August 2022. The candidates, who appeared for Bihar Police SI exam, must check their results before 4th September 2022. For Bihar Police vacancy 2020, the BPSSC had released as many as 1998 vacancies for the post of sub-inspector and 215 vacancies for the post of sergeant. Those who could not make it to the final merit list, should not lose their heart as the notification for 2022 is expected to be out very soon. The nervous system has two main parts:
The nervous system transmits signals between the brain and the rest of the body, including internal organs. In this way, the nervous system’s activity controls the ability to move, breathe, see, think, and more.1 The basic unit of the nervous system is a nerve cell, or neuron. The human brain contains about 100 billion neurons. A neuron has a cell body, which includes the cell nucleus, and special extensions called axons (pronounced AK-sonz) and dendrites (pronounced DEN-drahytz). Bundles of axons, called nerves, are found throughout the body. Axons and dendrites allow neurons to communicate, even across long distances. Different types of neurons control or perform different activities. For instance, motor neurons transmit messages from the brain to the muscles to generate movement. Sensory neurons detect light, sound, odor, taste, pressure, and heat and send messages about those things to the brain. Other parts of the nervous system control involuntary processes. These include keeping a regular heartbeat, releasing hormones like adrenaline, opening the pupil in response to light, and regulating the digestive system. When a neuron sends a message to another neuron, it sends an electrical signal down the length of its axon. At the end of the axon, the electrical signal changes to a chemical signal. The axon then releases the chemical signal with chemical messengers called neurotransmitters (pronounced noor-oh-TRANS-mit-erz) into the synapse (pronounced SIN-aps)—the space between the end of an axon and the tip of a dendrite from another neuron. The neurotransmitters move the signal through the synapse to the neighboring dendrite, which converts the chemical signal back into an electrical signal. The electrical signal then travels through the neuron and goes through the same conversion processes as it moves to neighboring neurons. The nervous system also includes non-neuron cells, called glia (pronounced GLEE-uh). Glia perform many important functions that keep the nervous system working properly. For example, glia:
The brain is made up of many networks of communicating neurons and glia. These networks allow different parts of the brain to “talk” to each other and work together to control body functions, emotions, thinking, behavior, and other activities.1,2,3 CitationsOpen Citations
The neuron and nervous systemIntroduction to neurons and glia. How the structure of a neuron allows it to receive and transmit information. The neuron and nervous systemBiology is brought to you with support from the Amgen Foundation |