The document discusses neurons and synapses in the human brain. It begins by showing an image of a small segment of the human brain, with lines representing neurons and dots representing synapses. It notes that synapses are crucial for neural communication and thought. While the number of brain cells does not increase much after birth, the connections between neurons through synapses continue developing. The document then provides explanations of key concepts regarding neurons, synapses, and neural signaling. It explains how neurons transmit electrical signals, how synapses allow signals to be transmitted between neurons, and how signals propagate along axons through action potentials.
My first attempt at this presentation for the IB Diploma Programme Biology course: topic 6.5 neurons and synapses. I'm hoping another great educator out there can take this, make it look a lot better, and then share it :)
Thanks to Steven Taylor and Chris Paine for all of their work and inspiration.
Please download and modify as you wish.
final note: I actually made this in google slides - I just checked the presentation and none of the links to the videos I used are there. Here is a link to the google slide presentation so you can find the videos: https://docs.google.com/a/igbis.edu.my/presentation/d/1eabpxEtwlDGt7EPRqQ_GPwxUBerszZQquWAhjRnU_WE/edit?usp=sharing
Nerve muscle physiology1 /certified fixed orthodontic courses by Indian denta...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdf
6.5 neurons and synapses (chris paine)
1. Essential idea: Neurons transmit the
message, synapses modulate the message.
6.5 Neurons and synapses
By Chris Paine
https://bioknowledgy.weebly.com/
The image shows a tiny segment of a human brain the lines
show neurons and the dots show synapses. The image is
intended to illustrate both the how complex even a small
mammal's brain is and additionally how important the synapses
between neurons are; it is the synapses that drive
communication and conscious thought. With the exception of
the memory centre the number of cells in the human brain does
not increase after birth, what increase is the number of
connections and hence synapses between neurons.
http://med.stanford.edu/mcp/_jcr_content/hero/hero_banner/images/ima
geSlide8.img.620.high.jpg
2. Understandings
Statement Guidance
6.5.U1 Neurons transmit electrical impulses.
The details of structure of different types of
neuron are not needed.
6.5.U2
The myelination of nerve fibres allows for
saltatory conduction.
6.5.U3
Neurons pump sodium and potassium ions
across their membranes to generate a resting
potential.
6.5.U4
An action potential consists of depolarization
and repolarization of the neuron.
6.5.U5
Nerve impulses are action potentials propagated
along the axons of neurons.
6.5.U6
Propagation of nerve impulses is the result of
local currents that cause each successive part of
the axon to reach the threshold potential.
6.5.U7
Synapses are junctions between neurons and
between neurons and receptor or effector cells.
Only chemical synapses are required, not
electrical, and they can simply be referred to
as synapses.
6.5.U8
When presynaptic neurons are depolarized they
release a neurotransmitter into the synapse.
6.5.U9
A nerve impulse is only initiated if the threshold
potential is reached.
3. Applications and Skills
Statement Guidance
6.5.A1
Secretion and reabsorption of acetylcholine by
neurons at synapses.
6.5.A2
Blocking of synaptic transmission at cholinergic
synapses in insects by binding of neonicotinoid
pesticides to acetylcholine receptors.
6.5.S1
Analysis of oscilloscope traces showing resting
potentials and action potentials.
5. 6.5.U5 Nerve impulses are action potentials propagated along the axons of neurons.
http://outreach.mcb.harvard.edu/animations/actionpotential_s
hort.swf
6. 6.5.S1 Analysis of oscilloscope traces showing resting potentials and action potentials.
https://phet.colorado.edu/en/simulation/neuron
Use the PhET simulation to
build an understanding of
resting and action
potentials and how they
relate to the voltage
changes in the axon
membrane.
The neuron lab worksheet
activity acts as a guide for
the investigation:
https://phet.colorado.edu/en/cont
ributions/view/3608
Investigate how neurons generate electrical impulses
7. 6.5.U3 Neurons pump sodium and potassium ions across their membranes to generate a resting potential.
Plasma membrane is 50 times
more permeable to K+ ions
than Na+
n.b. proteins inside the nerve fiber are negatively charged which increases the charge imbalance.
-70mV
8. 6.5.U4 An action potential consists of depolarization and repolarization of the neuron.
The sodium-potassium
pump (Na+/K+ pump)
maintains the
electrochemical gradient of
the resting potential. Some
K+ leaks out of the neuron
(making the membrane
potential negative, -70mv).
1 In response to a stimulus (e.g. change in membrane
potential) in an adjacent section of the neuron some
voltage gated Na+ channels open and sodium enters
the neuron by diffusion. If a sufficient change in
membrane potential is achieved (threshold
potential) all the voltage gated Na+ channels open.
The entry of Na+ causes the membrane potential to
become positive (depolarisation)
http://www.ib.bioninja.com.au/_Media/action_potential_med.jpeg
2
Action potential is the reversal (depolarization) and restoration (repolarization) of the membrane
potential as an impulse travels along it.
9. Action potential is the reversal (depolarization) and restoration (repolarization) of the membrane
potential as an impulse travels along it.
6.5.U4 An action potential consists of depolarization and repolarization of the neuron.
The depolarisation of the
membrane potential causes the
voltage gated Na+ channels to close
and the voltage gated K+ channels
open. K+ diffuses out of the neuron
rapidly and the membrane
potential becomes negative again
(repolarisation)
3
http://www.ib.bioninja.com.au/_Media/action_potential_med.jpeg
4 Before the neuron is ready to propagate another impulse the
distribution of Na+ (out) and K+ (in) needs to be reset by
the Na+/K+ pump, returning the neuron to resting potential. This
enforced rest (refractory period) ensures impulses can only travel in a
single direction.
10. Action potential is the reversal (depolarization) and restoration (repolarization) of the membrane
potential as an impulse travels along it.
6.5.U4 An action potential consists of depolarization and repolarization of the neuron.
http://www.ib.bioninja.com.au/_Media/action_potential_med.jpeg
From McGraw Hill:
http://goo.gl/tI2MD
http://www.wiley.com/WileyCDA/
11. http://highered.mheducation.com/ol
c/dl/120107/bio_d.swf
6.5.U6 Propagation of nerve impulses is the result of local currents that cause each successive part of the axon to
reach the threshold potential.
Propagation of a nerve impulse in un-myelinated axons
http://cnx.org/resources/0d4d8e978090c5adf07cc1661372b69be3496ec6/Figure_35_02_04.png
Cell body
12. 6.5.U4 An action potential consists of depolarization and repolarization of the neuron.
http://www.psych.ualberta.ca/~ITL/ap/ap.htm
http://www.mrothery.co.uk/images/nerveimpulse.swf
More action potential resources:
http://www.sumanasinc.com/webco
ntent/animations/content/actionpot
ential.html
http://highered.mheducation.com/olc/dl/12
0107/anim0013.swf
13. 6.5.U2 The myelination of nerve fibres allows for saltatory conduction.
http://cnx.org/resources/1a264d4943c1148665b7216c649d72ad774fc80b/Figure_35_02_05.jpg
http://antranik.org/wp-content/uploads/2012/04/conduction-in-a-myelinated-nerve-fiber-saltatory-conduction.jpg
myelination and saltatory conduction
*The jump along the axon is actually just the
very rapid conduction inside the myelinated
portion of the axon.
As myelin acts as an insulator myelinated
axons only allow action potentials to occur
at the unmyelinated nodes of Ranvier.
This forces the the action potential to jump* from
node to node (saltatory conduction).
The result of this is that the impulse travels much more
quickly (up to 200 m/s) along myelinated axons compared to
unmyelinated axons (2 m/s).
Saltatory conduction from node to node also
reduces degradation of the impulse and hence
allows the impulse to travel longer distances
than impulses in unmyelinated axons.
The myelin sheath also reduces energy expenditure over the
axon as the quantity of sodium and potassium ions that
need to be pumped to restore resting potential is less than
that of a un-myelintated axon
14.
15.
16. 6.5.U7 Synapses are junctions between neurons and between neurons and receptor or effector cells.
To function the nervous system needs to receive input/stimuli
and then to coordinate a response to it.
For this to happen impulses need to travel from sensory
receptor cells via a series of nerve cells to effectors, which
are commonly muscles and glands.
There are junctions between each cell called
synapses across which impulses cannot travel.
A special group of molecules called neurotransmitters move
across the synapse to effect an impulse in the adjacent cell.
18. 6.5.U8 When presynaptic neurons are depolarized they release a neurotransmitter into the synapse. AND 6.5.U9
A nerve impulse is only initiated if the threshold potential is reached.
19. 6.5.U8 When presynaptic neurons are depolarized they release a neurotransmitter into the synapse. AND 6.5.U9
A nerve impulse is only initiated if the threshold potential is reached.
20. 6.5.U8 When presynaptic neurons are depolarized they release a neurotransmitter into the synapse. AND 6.5.U9
A nerve impulse is only initiated if the threshold potential is reached.
21. 6.5.U8 When presynaptic neurons are depolarized they release a neurotransmitter into the synapse. AND 6.5.U9
A nerve impulse is only initiated if the threshold potential is reached.
22. 6.5.U8 When presynaptic neurons are depolarized they release a neurotransmitter into the synapse. AND 6.5.U9
A nerve impulse is only initiated if the threshold potential is reached.
23.
24.
25. 6.5.A1 Secretion and reabsorption of acetylcholine by neurons at synapses.
http://faculty.pasadena.edu/dkwon/chap%208_files/images/image61.png
Acetylcholine is a neurotransmitter used in many synapses through the nervous system
One use is at the neuromuscular junction, i.e. it is the molecule that motor neurons
release to activate muscles. Interfering with the action of acetylcholine can cause a
range of effect from paralysis to convulsions.
26. 6.5.A2 Blocking of synaptic transmission at cholinergic synapses in insects by binding of neonicotinoid pesticides
to acetylcholine receptors.
27. 6.5.A2 Blocking of synaptic transmission at cholinergic synapses in insects by binding of neonicotinoid pesticides
to acetylcholine receptors.
28. Nature of science: Cooperation and collaboration between groups of scientists - biologists are contributing to
research into memory and learning. (4.3)
Gero Miesenböck FRS
Waynflete Professor of
Physiology, Wellcome
Investigator
Martin Booth
Professor of
Engineering Science
Tim Vogels
Sir Henry Dale Fellow
(physicsist)
Stephen Goodwin
Professor of
Neurogenetics,
Wellcome Investigator
Korneel Hens
Group Leader
(Biochemist)
Scott Waddell
Professor of
Neurobiology,
Wellcome Trust Senior
Research Fellow in
Basic Biomedical
Sciences
http://www.cncb.ox.ac.uk/team/
Nowadays scientists often work in
multidisciplinary teams for example the Centre for
Neural Circuits and Behaviour (CNCB)
The aim of the CNCB is to understand how
intelligence emerges from the physical interaction
of nerve cells.
Studying the brain
from this top-
down approach to
answer such
fundamental
questions requires
techniques and
understanding
from a range of
disciplines.