th , march 7,2013 sit. materials out. backpacks away. silence
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Th , March 7,2013 Sit. Materials out. Backpacks away. Silence. First: Copy your objectives and homework To create a neuron model and to use this model to simulate neurotransmitter release To differentiate between neurotransmitters and hormones - PowerPoint PPT PresentationTRANSCRIPT
Th, March 7,2013Sit. Materials out. Backpacks away. Silence.
First: Copy your objectives and homework To create a neuron model and to use this model to simulate
neurotransmitter release To differentiate between neurotransmitters and hormones To correlate endocrine glands with their respective hormones. To explain what happens during reflex and feedback
Homework: Unit Test 2 ( March 11, 2012---Monday); Study guides due on that day. Paper copies available tomorrow, also on our wiki.
DO NOW QUESTION: On your post-its, copy and sign. I know that I have a major Unit Test on Monday. The results will affect my
grade greatly. It is my responsibility to get a copy of the Study guide. The study guide will be graded as an exam. I will be wasting my chance at success if I do not complete and turn in my study guide. I know that I also must study to be successful on this test. Being absent is NOT an excuse for not turning it in since I can email it to Ms. Ng by Sunday 11:59 pm. If absent, I will need to show up for Gertz Succeeds Tue/Fri next week to take the test, along with a letter from my doctor or parents.
What are we going to do today? Do Now Looking at our objectives Reflex arc lab Neuron modeling Action Potential notes Action Potential modeling Feedback Loops Endocrine gland+ hormone match Exit slip
Nervous System part 2,p.34
9b Students know how the nervous system mediates communication between different parts of the body and the body’s interactions with the environment.9c Students know how the feedback loops in the nervous and endocrine systems regulate conditions in the body.9d Students know the functions of the nervous system and the role of neurons in transmitting electrochemical impulses.
Reflexes
Nerve Pathways: routes where signals travel along the nerve. ( ex. 2 neurons/ 1 synapse)
Reflexes: rapid, involuntary response to stimuli which occur over simple nerve pathways called reflex arcs.
Reflex Arc
What are reflex arcs?
Nerve pathways that need to cross only 2 synapses before producing a response.
Sensory neuron-> spinal cord ( interneuron)-> motor neuron-> action
Why are reflex arcs important? Protects your body from injury
Your body responds quickly without thinking.
Reflex Arc Lab
Patellar (knee-jerk ) Reflex: two neurons/one synapse stretch reflex .
1. Have your partner sit on the lab table with legs hanging freely.
2. Sharply tap the knee of one leg, note the response.
3. Be sure to stand to one side.4. Compare responses in the right and left knees5. Record your results.6. Quick report should include: Title, Hypothesis,
Results ( Chart), Summary
How signals are transmitted through neurons http://www.youtube.com/watch?v=-
SHBnExxub8
Words:
Action Potential
Synapse
Neurotransmitter: chemicals that are released at the synapses from the synaptic terminal of the axon of the first neuron. These will merge with the dendrites of the second neuron.
What happens when the signal is transmitted to another neuron?
Neuron Model/ Neurotransmitter Modeling In groups, create a model of the
neuron and the neurotransmitter.
Create your labels using post-its
Simulate how a signal travels ( show this with arrows using your post its)
Endocrine System, p.35
9c Students know how the feedback loops in the nervous and endocrine systems regulate conditions in the body
Definitions
Hormone: chemicals secreted by cells that regulate other cells
Gland: organ whose cells secrete chemicals into other regions of the body
-> Endocrine gland: ductless -> Exocrine gland: deliver
hormones via ducts
Regulation & Communication Animals rely on 2 systems for
regulation endocrine system ▪ system of ductless glands (->extracellular
fluid)▪ secrete chemical signals directly into blood▪ chemical travels to target tissue▪ target cells have receptor proteins▪ slow, long-lasting response
nervous system▪ system of neurons▪ transmits “electrical” signal &
release neurotransmitters to target tissue▪ fast, short-lasting response
Regulation by chemical messengers Neurotransmitters released by neurons Hormones release by endocrine glands
axon
endocrine gland
receptor proteins
target cell
receptor proteins
hormone carried by blood
neurotransmitter
Lock & Keysystem
Maintaining homeostasis
high
low
hormone 1
lowersbody condition
hormone 2
gland
specific body condition
raisesbody condition
gland
Negative FeedbackModel
Controlling Body Temperature
high
low
nerve signals
sweat
nerve signals
body temperature(37°C)
shiver
dilates surfaceblood vessels
constricts surfaceblood vessels
Nervous System Control Feedback
hypothalamus
hypothalamus
liver
pancreas
liver
Regulation of Blood Sugar
blood sugar level(90mg/100ml)
insulin
body cells takeup sugar from blood
liver storesglycogen
reducesappetite
glucagon
pancreas
liver releasesglucose
triggershunger
high
low
FeedbackEndocrine System Controlislets of Langerhans beta islet cells
islets of Langerhansalpha islet cells
Hormone + Glands Match Pituitary Gland->
Adrenal Gland->
Pancreas->
Testis->
Ovary->
Body Structures+Hormone Match Insulin?
ADH ( Antidiurectic Hormone)->
Oxytocin->
Parathyroid Hormone->
Growth Hormone->