November 18-19, 2013

Nervous System Fun Facts Which “fact” is false? 1) All body functions are controlled and regulated by the nervous system 2) There are more neurons in the brain then there are stars in the Milky Way galaxy 3) The left side of the body is controlled by the right side of the brain and vice-versa 4) The brain reaches maturity at around 25 years of age. The endocrine system also controls and regulates some body functions, especially metabolism, growth, and reproduction.

Nervous System Functions The nervous system has three major functions: 1) Sensory input 2) Integration 3) Motor output

Nervous System Functions 1) Sensory input – the body gathers information, or stimuli, from the internal or external environment Ex) seeing a bright light

Nervous System Functions 2) Integration– the body processes information and makes a decision about what should be done Example: “decision” to initiate flight – or- fight response

Nervous System Functions 3) Motor Output– the body activates muscles or glands to effect a response. Example: moving your arm to grab a chip

Nervous System Functions Which function(s) are demonstrated in these examples? You hear a buzzing sound. You weigh the pros and cons of two different universities, and make a choice. You move your leg You touch a hot stove and jerk your hand back. Sensory input Motor output integration Sensory input, integration, motor output

Nervous System Organization The nervous system can be organized by structure and by function.

Nervous System Organization Structurally, the nervous system is organized into The central nervous system, which consists of the brain and spinal cord, and which acts to integrate (interpret & issue instructions for) stimuli The peripheral nervous system which consists of all the nerves outside the brain and spinal cord. These receive stimuli and effect responses in muscles and glands.

Nervous System Organization

The peripheral nervous system can be further divided into: 1)Afferent or sensory neurons - bring stimuli -- affect the body by internal or external information 2)Efferent or motor neurons -- cause muscles or glands to respond -- effect a change / response Mneumonic: A comes before E

Nervous System Organization The efferent / motor neurons can be further divided into: 1)Somatic neurons - neurons that control skeletal muscles - mostly voluntary 2)Autonomic neurons -- neurons that control smooth and cardiac muscle and glands - involuntary

Nervous System Organization Determine which parts of the nervous system are involved in these: You hear a buzzing sound. You weigh the pros and cons of two different universities, and make a choice. You move your leg You touch a hot stove and jerk your hand back.

Nervous System Organization Determine which parts of the nervous system are involved in these: You hear a buzzing sound. You weigh the pros and cons of two different universities, and make a choice. You move your leg You touch a hot stove and jerk your hand back. Afferent (peripheral) Central nervous system 1)Afferent (peripheral) 2)Central nervous system 3) somatic (efferent, peripheral)

Exit Ticket – Complete two vocab mini posters Closure What were our objectives today and what are your biggest take-aways? How does what we did today relate to our unit objective? How does what we did today related to LP or TOK? Homework Complete neuroglia reading and worksheet, if not yet done Read chapter 7