The neuromuscular junction is the synapse between a motor neuron and muscle fiber. When an action potential reaches the presynaptic terminal, voltage-gated calcium channels open to allow calcium influx, triggering the release of acetylcholine (ACh) vesicles. ACh then diffuses across the synaptic cleft and binds to nicotinic receptors on the postsynaptic membrane of the muscle fiber. This opens ligand-gated sodium channels, causing sodium influx and generating an endplate potential that depolarizes the muscle fiber. If the endplate potential reaches threshold, it triggers an action potential in the muscle fiber, leading to contraction. Acetylcholinesterase then breaks down ACh to terminate the signal and allow muscle
Neuromuscular junction (nmj ) It's essential for muscle contraction and invol...harleynyshake
The neuromuscular junction (NMJ) is a specialized synapse between a motor neuron and a muscle fiber. It's essential for muscle contraction and involves several key players like neurotransmitters, receptors, and ion channels. When an action potential reaches the NMJ, it triggers the release of acetylcholine, which binds to receptors on the muscle fiber, leading to depolarization and ultimately muscle contraction.
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!
Neuromuscular junction (nmj ) It's essential for muscle contraction and invol...harleynyshake
The neuromuscular junction (NMJ) is a specialized synapse between a motor neuron and a muscle fiber. It's essential for muscle contraction and involves several key players like neurotransmitters, receptors, and ion channels. When an action potential reaches the NMJ, it triggers the release of acetylcholine, which binds to receptors on the muscle fiber, leading to depolarization and ultimately muscle contraction.
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!
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?
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
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
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Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
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A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
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.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
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A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2. Neuromuscular junction
(example of chemical synapse)
Neuromuscular junction : the synapse
between motor neuron and muscle fiber is
called the neuromuscular junction
Motor neurons : are the nerves that
innervate muscle fibers
Motor unit : single motor neuron and the
muscle fibers it innervate
2
3. Physiologic anatomy of N.M
junction (continued)
As axon approaches muscle , it divides
into many terminal branches and loses
its myelin sheath
Each of these axon terminal forms
special junction ,a neuromuscular
junction with one or more muscle fiber
3
5. Physiologic anatomy of N.M
junction (continued)
The axon terminal is enlarged into a knoblike
structure ,the terminal botton,which fits into
shallow depression in underlying muscle fiber
5
7. Sequence Of Events At Neuromuscular Junction
Action potential
Action potential
Ca2+
Ca2+
Presynaptic
terminal
Presynaptic
terminal
Voltage-gated
Ca2+ channel
Voltage-gated
Ca2+ channel
7
Action potentials arriving at the presynaptic terminal
cause voltage-gated Ca2+ channels to open.
8. Sequence Of Events At Neuromuscular Junction
(continued)
Ca2+ diffuse into the cell and cause synaptic vesicles to release
acetylcholine, a neurotransmitter molecule.
Ca2+
Ca2+
Synaptic
vesicle
Synaptic
vesicle
Acetylcholine
Acetylcholine
8
Ca2+ uptake into the terminal causes release of th
neurotransmitter acetylcholine into synaptic cleft , which ha
been synthesized and stored into synaptic vesicles
9. Sequence Of Events At Neuromuscular Junction
(continued)
Ach travels across the synaptic cleft to postsynaptic membrane
which is also known as motor end plate.
Acetylcholine diffuses from the presynaptic terminal across the
synaptic cleft.
Synaptic cleft
Synaptic cleft
Acetylcholine
Acetylcholine
Presynaptic
terminal
Presynaptic
terminal
Ca2+
Ca2+
9
10. Sequence Of Events At Neuromuscular Junction
(continued)
Motor end plate contains nicotinic receptors
for Ach , which r ligand gated ion channels
Ach binds to the alpha subunits of nicotinic
receptors and causes conformational change.
When conformational changes occurs ,the
central core of channels opens & permeability
of motor end plate to Na+ & K+ increases
10
12. Sequence Of Events At Neuromuscular Junction
(continued)
Acetylcholine molecules combine with their receptor sites and
cause ligand-gated Na+ channels to open.
Na+
Na+
Acetylcholine bound
to receptor site opens
ligand-gated Na+
channel
Acetylcholine bound
to receptor site opens
ligand-gated Na+
channel
12
13. End plate potential
When the ion channel on post synaptic membrane
opens both Na+ & K+ flow down their concentration
gradient.
At resting potential net driving force for Na+ is much
greater than K+ ,when Ach triggers opening of these
channels more Na+ moves inwards than K+ out
wards, depolarizing the end plate.this potential
change is called end plate potential (EPP).
EPP is not an action potential but it is simply
depolarization of specialized motor end plate
13
14. End plate potential (continued)
Small quanta (packets) of Ach are released randomly
from nerve cell at rest, each producing smallest
possible change in membrane potential of motor end
plate, the MINIATURE EPP.
When nerve impulse reaches the ending, the number
of quanta release increases by several folds and
result in large EPP.
EPP than spread by local current to adjacent muscle
fibers which r depolarized to threshold & fire action
potential
14
15. Acetyl cholinesterase ends Ach activity at N.M
junction
To ensure purposeful movement ,muscle cell
electrical response is turned off by
acetylcholinestrase(AchE), which degrade Ach to
choline & acetate
About 50%of choline is returned to the
presynaptic terminal by Na+choline transport to
be reused for Ach synthesis.
Now muscle fiber can relax ,if sustained
contraction is needed for the desired movement
another motor neuron AP leads to release of
more Ach 15