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->