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BYU-I - BIO 264 - BIO 264, Week 1 - Class Notes

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BYU-I - BIO 264 - BIO 264, Week 1 - Class Notes

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background image Week 1 – Module 1  Day 1 – 1.1 
Neuromuscular Junction
- Action Potential sweeps down the neuron 
- Voltage opens the Gated Sodium Channel (brings in Sodium)
- When the Na+ comes in the neuron becomes positive and polarization 
occurs - Then Opens a Voltage gated sodium channel Ca+ 
- Calcium binds to a snare protein which causes exocytosis of 
Acetylcholine  - Vesicles are full of neurotransmitters Acetylcholine and when the snare protein binds to the calcium the Acetylcholine is released  - Acetylcholine binds to a ligand gated cation channel bringing in sodium
- sodium goes down a t-tubal channel which opens a DHP channel
- when DHP opens so does rianadean which allows calcium to bind to 
triponanin creating tripomyasin  - All this shortens the muscle  Day 2 – 1.2 Hippocampus - the part of the brain that helps turn short term memories into long  term memories - “If you see a hippo on campus you will never forget it” - After 10 minutes, you lose 35% of the information you just learned 
- Review that day to move information from short term to long term 
memory  - The more you review the better option you have to remember
background image o Same day review
o 24 hours later
o 1 week later (or sooner)
o 1 month later (or sooner)
- Build study habits that activate the brain  Thermostats monitor temperature - The have a normal range
- The middle of the normal range is called set point 
- If you start to move away from the set point the thermostat will bring it
back towards the set point, this is called negative feedback  - Positive feedback takes you away from set point 
- Negative feedback is good and positive feedback is bad 
Five Components 1. Stimulus
2. Receptor – detects change – skin 
3. Afferent Fibers/Pathway – enters the control center – sensory nerves 
4. Control center- decides to turn on or off an effector - Brain 
5. Efferent Fibers/ Pathway – exit the control center and got to the 
Effector - motor nerves 6. Effector- things that make the change – skin or muscles
7. Response 
S is a RACEER to and from the control center  Sweat Gland is surrounded by smooth muscle, when the muscle contracts it 
squeezes the gland and out comes sweat 
Body temp set point is 98.6 and hovers from 98.4-98.8
When you are to hot your body releases sweat, when you are to cold your 
muscles shake to warm you up 
When you go back towards set point it is negative feedback 
When you keep moving farther away from set point it is positive feedback 
When your blood pressure goes down your heart rate goes up, this is 
negative feedback 
Positive occurs when negative feedback fails 
Increased peripheral Resistance means muscles are clamping down 
Homeostasis – to stay the same  Day 3 – 2.1 

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School: Brigham Young University - Idaho
Department: Biology
Course: Human Anatomy and Physiology I
Professor: Lanning Baker
Term: Fall 2016
Name: BIO 264, Week 1
Description: These notes cover the material covered in class from week 1.
Uploaded: 01/15/2018
6 Pages 34 Views 27 Unlocks
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