nervous system

• the nervous system 3 main parts the brain, spinal cord, and nerves
• Central Nervous System: Brain and spinal cord, controls all body functions
• central nervous system receives and processes all of the information from all parts of the body
• our nervous system connects all our body parts and transmits signals from one part to another
• brain- the organ that controls all the body's activities and functions, including thinking, feeling, and movement
• three main part of the brain: cerebrum, cerebellum and brain stem
• cerebrum-large upper part od the brain that controls activity and thought.
• cerebellum- controls muscle coordination, balance, and posture
• brain stem-
• brain stem- controls automatic functions of the body, such as breathing, heart rate, and blood pressure
• Spinal cord- contains nerves that carry messages from the brain to the body
• Peripheral Nervous System- Connects the CNS to the organs and limbs
• two main parts divisions of PNS: somatonic nervous system and autonomic nervous system
• Somatic Nervous System- Controls voluntary movements and sensations
• Autonomic Nervous System- Regulates involuntary actions like digestion, heartbeat, and breathing.
• two main parts of SNS: spinal nerves and cranial nerves
• two subdivions of the autonomic nervous system the sympathetic and parasympathetic
• spinal nerves-the nerves that carry motor and sensory signals between the spinal and the body
• cranial nerves- the nerve fibers that carry information into and out of the brain stem
• sympathetic division- prepares the body to respond to stressful situations by increasing blood pressure, heart rate, respiration, etc.
• parasympathetic division- slows down bodily functions when they are not needed (e.g., during sleep or rest)
• stimulus: a thing or event that evokes a specific functional reaction in an organ or tissue
• nerve cells are specialised to carry electrical impulses around the body
• parts of neuron: cell body, dendrites and axon
• types of neurons: sensory neurons and motor neurons
• sensory neurons- carry impulses from receptors to the CNS
• motor neurons-transmit impluses from the ebrian to muscles,glands or other neuron in the pns
• nerve impluse- when the nerve is stimulated by an electric current, the impulse is transmitted along the axon
• how does a nerve impluse travel across neurons?


  when a nerve impluse comes to the end of an axon, it produces the chemical, called neuro transmiter, to be released
• the chemical acrosses the space between neurons called synapse
• what factors help our nervous system in carrying out its function?

  ears,eyes,skin,nose,tongue