Nervous system

• The CNS consists of the brain and spinal cord, while the PNS includes all other nerves outside these structures.
• The nervous system is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS).
• Neurons have three main parts: the cell body, dendrites, and an axon.
• The spinal cord extends from the base of the skull to the lumbar region of the vertebrae.
• The autonomic nervous system regulates involuntary functions such as breathing, heartbeat, and digestion.
• Dendrites receive signals from other neurons or sense organs.
• Axons transmit electrical impulses away from the cell body.
• Motor neurons carry impulses away from the CNS.
• Sensory neurons carry impulses toward the CNS.
• Axons are long extensions of nerve cells that conduct impulses away from the cell body.
• Dendrites receive incoming messages from other neurons.
• The parasympathetic division restores normal functions when the body is at rest.
• The central nervous system (CNS) consists of the brain and spinal cord.
• Nervous system is a system of cells, tissues, and organs that regulates the body's response to internal and external stimuli. It also connects all body parts and transmits signals from one part to another
• The 2 major divisions of nervous system are the central nervous system (CNS) and the peripheral nervous system (PNS)
• The peripheral nervous system connects the central nervous system to the organs and limbs
• The central nervous system serves as the main processing center of the entire nervous system.
• The two major parts of the central nervous system is the brain and the spinal cord
• The brain is the organ located within the skull that functions as organizer and distributer of information in the body. It is also known as the control center.
• The spinal cord serves as the channel of signals between the brain and the rest of the body. It controls the simple musculoskeletal reflexes without input from the brain.
• The brain stem connects the brain to the spinal cord that controls breathing, digestion, heart rate, and blood pressure.
• The peripheral nervous system has two parts, the somatic nervous system and the autonomic nervous system
• The somatic nervous system is associated with the voluntary and conscious control of the body movements. It is also connected with the muscular and external sensory system.
• the autonomic nervous system is associated with the involuntary control of the body movements
• The somatic nervous system has two main nerves, the spinal nerves and the cranial nerves
• The spinal nerves carries motor and sensory signals between the spinal cord and the body.
• The cranial nerves are nerve fibers that carry information into and out of the brain stem.
• the autonomic nervous system has two main parts, the sympathetic and parasympathetic.
• The sympathetic is activated when the body is in a dynamic role of stress (increased heart rate and breathing, dilation of pupils, sweating.
• The sympathetic is also known as the fight or flight response
• The parasympathetic maintains body functions and restores the body to normal to relax mode.
• The parasympathetic is also known as the rest and digest response
• nerve cells are the basic unit of the nervous system. They are also called as neurons.
• Neurons or nerve cells have the special ability to carry signals or impulses
• a nerve impulse is an electrochemical signal moving along a neuron.
• synapse is the space between neurons
• a stimulus is any factor in the environment that influences behavior
• a response is a reaction to a condition or stimulus
• an organism must be able to respond to a stimulus in order to survive.
• reaction time is the length of time between application of a stimulus and detection of a response.