2. 3 kinds of neurons: Sensory, Interneuron, and Motor neurons. Explain what each neuron does:  Sensory neurons --- picks up stimuli from the environment by use of senses and converts stimuli into a nerve impulse. Ex. Stimuli --- hunger or a hot stove.  Interneuron --- A neuron that carries nerve impulses from one neuron to another.  Motor neuron --- Sends an impulse to a muscle, and the muscle contracts in response. (Motor = movement).

3. Dendrites – receive info from other neurons -Cell Body – dendrites carry info to cell body -Axons – transmits info away from cell body in form of electrical signals (action potentials) Neuron function is dependent upon electrical activity. Action Potential (Na + in, K + out) -transmission of a action potential. - ATP driven sodium-potassium pump re- establishes equilibrium.

4.  Neurons are not connected to each other.  Synaptic gap or cleft  Neurotransmitters are chemicals that are released into the synaptic cleft which cause electrical activity in another neuron.

6.  Scenario: Someone taps you on the shoulder  Receptors in the skin sense a tap on the shoulder.  Sensory neurons transmit the touch message.  The message is interpreted. a response is sent to the motor neurons.  Motor neurons transmit a response to the shoulder muscle.  The neck muscles are activated, causing the head to turn.

7.  Central: Made up of the brain & spinal cord.  Brain --- controls most functions  Spinal Cord --- Covered with nerve tissues that link the brain to most nerves.  Peripheral: Made up of the nerves that branch out from the brain & spinal cord. - afferent neurons (towards) - efferent neurons (away) 

9.  Divided into sensory division vs. motor division  Sensory Division – contains sensory receptors and interneurons that connect them to the central nervous system  Motor Division Somatic Nervous System Autonomic Nervous System

10.  Autonomic nervous system regulates activities that are automatic or involuntary.  For example – if you are running, your autonomic NS speeds up your heart rate and blood flow, stimulates sweat glands, and slows down contractions in digestive system  Autonomic NS is split into Sympathetic vs. Parasympathetic NS  Sympathetic speeds up activities while the parasympathetic slows activities down.

11. Divisions of the Nervous System Central Nervous SystemPeripheral Nervous System Made of the brain and spinal cord Somatic NS Autonomic NS Regulates activities that are automatic Regulates activities under conscious control Parasympathetic – slows down activities Sympathetic – Speeds up activities

12.  Cerebrum : Interprets input from the senses, controls movement of muscles, & carries out complex mental processes (learning, remembering, & making judgments)

13.  Cerebellum: Coordinates the actions of your muscles & helps keep balance.

14.  Medulla --- controls involuntary actions (automatic actions – don’t have to think about doing these).  Examples – breathing, heartbeat, blinking.

15.  Spinal cord – links brain to nerves and supports your body.  Spinal nerves --- Impulses travel to & from the CNS via these nerves. Controls responses.

16. Mechanoreceptors Photoreceptors Chemoreceptors Thermoreceptors Pain receptors Main sense organs: eyes, ears, nose, mouth & skin