Daily TriviaDaily TriviaThe moon is moving away The moon is moving away from the earth at 3.8cm per from the earth at 3.8cm per year.year.– 3.8m per century3.8m per century

It is currently about It is currently about 384,467 km from Earth384,467 km from Earth

AgendaAgendaDaily TriviaDaily TriviaAgendaAgendaReturn CrateReturn CrateFinal check for Grade AuditFinal check for Grade Audit– EVERYTHING is due NOW or EVERYTHING is due NOW or

it is a zero!it is a zero!Nervous System NotesNervous System NotesHomeworkHomeworkWork timeWork time

The Nervous System!The Nervous System!

Two SubsystemsTwo SubsystemsCNS – Central Nervous SystemCNS – Central Nervous SystemPNS – Peripheral Nervous SystemPNS – Peripheral Nervous System

Sensory Input -> Sensory Input -> Integration -> Integration ->

Motor outputMotor output

Nerve StructureNerve Structure

Nerve StructureNerve StructureNeurons = nerve cellsNeurons = nerve cellsLong conductive cells that have 3 Long conductive cells that have 3 regionsregions– Cell bodyCell body– DendritesDendrites– AxonAxon

Nerve StructureNerve StructureDendrites are branchlike extensions Dendrites are branchlike extensions that receive impulses.that receive impulses.

The axon carries the impulses to The axon carries the impulses to other cells.other cells.

V. Peripheral Nervous SystemV. Peripheral Nervous System

A. ReceptorsA. Receptors

1. Mechanoreceptors1. Mechanoreceptorsa)a) Sensory Receptor that responds to Sensory Receptor that responds to

mechanical (physical) pressure or mechanical (physical) pressure or distortion.distortion.

b)b) Found in skin, base of hair, etc.Found in skin, base of hair, etc.

c)c) Your ear canal has the most sensitive Your ear canal has the most sensitive mechanoreceptors in your body.mechanoreceptors in your body.

2. Chemoreceptors2. Chemoreceptorsa)a) Responds to chemical stimuliResponds to chemical stimuli

b)b) Chemoreceptors found on the Chemoreceptors found on the synaptic bulb responds to the synaptic bulb responds to the neurotransmitters. neurotransmitters.

c)c) Taste, smell, and pheromone Taste, smell, and pheromone detection.detection.

3. Thermoreceptors3. Thermoreceptorsa)a) Respond to changes in temperature.Respond to changes in temperature.

b)b) Humans can detect a 1Humans can detect a 1°° decrease in decrease in temperature, but can only detect a temperature, but can only detect a 33°° increase in temperature. increase in temperature.

4. Photoreceptors4. Photoreceptorsa)a) Respond to lightRespond to light

b)b) Captures particles of light called Captures particles of light called photons.photons.

c)c) The eye uses 2 types of photoreceptorsThe eye uses 2 types of photoreceptorsi.i. RodsRodsii.ii. ConesCones

5. Proprioceptors5. Proprioceptorsa)a) Senses spatial awarenessSenses spatial awareness

b)b) Alcohol influences the effectiveness Alcohol influences the effectiveness of proprioceptors.of proprioceptors.

6. Nociceptors6. Nociceptorsa)a) Senses painSenses pain

b)b) Located throughout the body, Located throughout the body, however they are not found in the however they are not found in the brainbrain