Presentation on theme: "Unit 11- Nervous System Nervous System Receives and relays information Monitors and responds to changes (internal, external) Stimulus-Response."— Presentation transcript:
Unit 11- Nervous System Nervous System Receives and relays information Monitors and responds to changes (internal, external) Stimulus-Response
Receptors & Effectors Receptor Structure that detects change Ex. skin, rods, cones, taste buds Effector Structure that responds to a stimulus Ex. muscles, glands
Neuron Individual nerve cell 3 types Sensory neuron carries impulses from receptors to brain/spinal cord Motor neuron carries impulses from brain/spinal cord to effectors Interneuron connect the sensory to the motor neurons
Nerve Impulse Due to movement of Na+ ions and K+ ions Polarized = “-“ inside “+” outside Resting Potential Depolarized- ions move, neuron becomes “+” inside, “-“ outside Repolarized- ions move again, return to “-“ inside, “+” outside
Nerve Impulse Action Potential Depolarization and repolarization of a neuron membrane Threshold The minimum level of stimulus needed to start an impulse Neurotransmitter Chemicals released at the axon terminals Carry the “impulse” across the synaptic gap
3 Basic Parts of Neuron Dendrite Cell Body Axon
Diagram of Impulse Diagram A #1= polarized Diagram B #3= polarized #2= depolarized Diagram C #6= polarized #5= depolarized #4= repolarized
Neuron Structure (p 1006) #5. Dendrite- Extension that receives message and carries impulse toward cell body #4. Cell body Contains the nucleus(#1) and most cytoplasm of neuron
Neuron Structure (p 1006) #2. Axon Extension that carries impulse away from cell body Myelin- sheath that surrounds axon Schwann Cell- makes up myelin Node- space between Schwann Cells Axon terminal- end of axon at synapse
Diagram- Neuron Structure (p 1006) #3. Synapse Small gap between neurons
Right-Left Brain?? Write Bat Throw Wave “hello” Leg crossed Hold fork Fold hands Take off shoe Standing weight First step Start skipping Kick Dominant eye Draw a dog Draw circle Switch hands draw circle Count R’s and L’s
Brain Functions 1. You are welcomed in the kitchen by the smell of one of your favorite foods. You immediately ask what time the meal is being served. 2. While you are studying in the library, two of your friends pass by your table. You stop them to talk for a few minutes.
Brain Functions 3. You have been jogging for twenty minutes. Your heartbeat and breathing rates have increased. 4. You are working a gymnastics routine. You attempt to execute a difficult spin on the balance beam.
Brain Functions 5. You notice that each time you wear a certain wool sweater, your skin itches where it contacts the wool. 6. While visiting the ocean you mastered the skills necessary for riding a surfboard.
Brain Functions 7. You are planning to audition for a role in the school play. The role requires someone who can project various emotions. 8. You are sampling different types of perfume in order to pick out which one you would like to buy.
Brain Functions 9. After being out in the snow for awhile, your body begins to shiver. 10. After twisting your knee during soccer practice, you find that a whirlpool relieves the pain.
Brain Functions 11. While playing basketball, you steal the ball at mid-court and make a basket to tie the score. 12. You have just find out that your dog has chewed up your favorite pair of tennis shoes. You shout at the dog and slam your bedroom door. 12. You have just find out that your dog has chewed up your favorite pair of tennis shoes. You shout at the dog and slam your bedroom door.
Brain Functions 13. At a picnic you ate some fried chicken and apple pie. 14. You are taking a test that involves placing blocks of certain colors and shapes into certain areas.