BODY SYSTEM WORKBOOK Learning Target: Identify the function & organs in the nervous system Science Starter: Read pg. 442 (Excretory systeem) in reading packet and answer question #4

Announcements 1. Return all graded papers 2. Bring both workbooks, weekly homework & readings to class daily 3. Remember all test corrections and missing work is due by Friday at 3:30! Otherwise those grades will be entered as 0’s. (You will have 2 more grades this 6 weeks.) 4. HW 29 (white) Question of the Day

The Nervous System

Functions of the Nervous System the center of all thought, learning and memory

Functions of the Nervous System the center of all thought, learning and memory regulates and maintains homeostasis (a state of balance) examples: body temperature, heart rate, respiration, digestion

Functions of the Nervous System the center of all thought, learning and memory regulates and maintains homeostasis (a state of balance) examples: body temperature, heart rate, respiration, digestion keeps us in touch with our internal and external environment

Two Divisions of the Nervous System Central Nervous System- brain and spinal cord

Two Divisions of the Nervous System Central Nervous System- brain and spinal cord Three Main Parts of Brain: Cerebrum- interprets input from senses and controls voluntary muscles

Two Divisions of the Nervous System Central Nervous System- brain and spinal cord Three Main Parts of Brain: Cerebrum- interprets input from senses and controls voluntary muscles Cerebellum- coordinates actions of muscles and helps keep your balance

Two Divisions of the Nervous System Central Nervous System- brain and spinal cord Three Main Parts of Brain: Cerebrum- interprets input from senses and controls voluntary muscles Cerebellum- coordinates actions of muscles and helps keep your balance Brainstem- controls homeostasis and coordinates involuntary muscles

What is this part of the brain called? Cerebrum Cerebellum Brain stem Spinal cord

What is the function of the brain stem? Controls homeostasis & voluntary muscles Controls senses & voluntary muscles Controls balance & coordinates muscles Controls homeostasis & involuntary muscles

When you feel hungry, what function is your nervous system trying to carry out? Maintaining homeostasis Moving your body Sensing your environment Keeping your balance

Two Divisions of the Nervous System Peripheral Nervous System- connects the Central Nervous System to the rest of the body

Two Divisions of the Nervous System Peripheral Nervous System- connects the Central Nervous System to the rest of the body Two Groups: Somatic nervous system- controls voluntary actions and input from senses (sound, sight, touch, etc.)

Two Divisions of the Nervous System Peripheral Nervous System- connects the Central Nervous System to the rest of the body Two Groups: Somatic nervous system- controls voluntary actions and input from senses (sound, sight, touch, etc.) Autonomic nervous system- controls homeostasis by regulating the heart, breathing, and digestion without conscious thought

Which division of the nervous system is made up of the brain & spinal cord? Autonomic nervous system Somatic nervous system Central nervous system Peripheral nervous system

Which part of the Peripheral Nervous System controls processes that maintain homeostasis without you even thinking about it? Autonomic nervous system Somatic nervous system Central nervous system Peripheral nervous system

Nerve cells are called neurons Impulse- a message carried by a neuron

Nerve cells are called neurons Impulse- a message carried by a neuron Synapse- the small space that an impulse jumps between neurons

Types of Neurons Sensory neurons: in the skin, muscles, joints, and organs that can sense pressure, temperature, and pain 

Types of Neurons Sensory neurons: in the skin, muscles, joints, and organs that can sense pressure, temperature, and pain  neurons in nose & tongue sense tastes and smells neurons in inner ear sense sounds rods and cones in eye sense sight

Types of Neurons Motor neurons: stimulate muscle cells throughout the body

Types of Neurons Motor neurons: stimulate muscle cells throughout the body includes muscles of the heart, diaphragm, intestines, and bladder

Types of Neurons Interneurons: connect other neurons

Types of Neurons Interneurons: connect other neurons all neurons in the central nervous system (brain, spinal cord) are interneurons

Reflex Reflex- an involuntary response to a stimulus (change in environment) that allows the body to respond quickly without thinking about it.

What is an impulse? A nerve cell A message carried by neurons The space between two neurons A reflex

What is this structure called? Axon Synaptic terminal Nucleus Dendrite

What does a motor neuron stimulate? Brain cells Sensory organs Muscle cells Sensory neurons

Which is not true about a reflex? It is a quick response. It is voluntary. It does not require conscious thought. It is a response to an external stimulus.

BONUS: What is a change in the environment that your body responds to called? Stimulus Response Reflex Sense

Reaction Time 1. Hold an arm out with palm down. Put a penny on the center of the back of your hand. 2. Slowly tilt your hand to the side so that the penny slides off. Try to catch the penny with the same hand. 3. We will repeat this 9 times to see if our reaction time or catches improves!