2 Do Now 3/1/13What is the process that keeps internal conditions relatively constant despite changes in the external environment?In a resting membrane of a neuron, what is the overall charge inside? What is the charge outside?During an action potential, what happens to the charges?What chemical is released in the synapse?
3 The Central Nervous System (CNS) The central nervous system relays messages, processes information, and analyzes informationControl center of the bodyConsists of the brain and spinal cord
4 The Central Nervous System (CNS) Meninges = 3 layers wrapped around brain and spinal cordCerebrospinal fluid (CSF) = bathes brain and spinal cord and protects the central nervous system
5 The Brain The Cerebrum Largest part of the human brain Voluntary and conscious activitiesSite of intelligence, learning, and judgmentEach half deals with the opposite side of the body
6 The Brain The Cerebellum 2nd largest region of the brain, known as the “little brain.”Coordinates and balances the actions of the muscles
7 The Brain The Brain Stem Connects the brain and spinal cord Consists of the Pons and Medulla OblongataControls blood pressure, heart rate, breathing, swallowing, visceral organs (autonomic)
8 The Brain Thalamus Hypothalamus Receives messages and relays messages to proper regions of the cerebrum for processingHypothalamusControl center for recognitionAnalysis of hunger, thirst, fatigue, anger, and body temperatureCoordinates nervous system with the endocrine system
10 The Spinal CordMain communication link between the brain and the rest of the body31 pairs of spinal nerves branch out to communicate information to different parts of the bodyReflexes are processed directly to the spinal cordReflex = quick automatic response to a stimulus
11 The Peripheral Nervous System (PNS) Outside of the Central Nervous SystemDivided into the sensory division and motor divisionSensory Division of the PNS transmits impulses from sense organs to the CNS.Motor Division transmit impulses from the CNS to the muscles or glands.
12 The Peripheral Nervous System (PNS) Somatic Nervous SystemRegulates activities under conscious controlSome somatic nerves are also involved with reflexes that can act with our without conscious control
13 The Peripheral Nervous System (PNS) Reflex arc = involves sensory neuron, motor neuron and effector (sometimes interneurons)Neurons in spinal cord automatically activates motor neurons before information relayed to brain
14 The Peripheral Nervous System (PNS) Autonomic Nervous SystemRegulates activities that are automatic, or involuntary (not under conscious control).Subdivided into 2 parts:Sympathetic nervous system (fight and flight)Parasympathetic nervous system (rest)Opposing effects of sympathetic and parasympathetic help maintain homeostasis.Ex. Heart rate increased by sympathetic but decreased by parasympathetic
15 Due Today 3/1/13Do the Quick Lab on page You will need safety goggles, a sheet of scrap paper, and another sheet of paper to answer the questions.Do 35-3 Section Assessment #1, 3-6 on page 905.
16 Do Now 3/5/13Which part of the brain is involved in balance and coordination?Which part of the brain is involved in controlling heart rate, blood pressure, visceral organs, and body temperature?Which part of the brain is involved in learning?What is the CNS made of?What is the PNS made of?What does the Autonomic Nervous System control?What does the Somatic Nervous System control?What are the two parts of the Autonomic Nervous System?Which one deals with fight or flight?Which one deals with rest?