Catalyst University
Sympathetic Structures (Gray and White Rami Communicantes) & Innervation to the Skin
In this video, we discuss the pathway for sympathetic innervation to the skin after briefly reviewing the part of the spinal nerve and rami communicantes.
Professor Dave Explains
Neural Conduction, Action Potential, and Synaptic Transmission
We have probably heard that neurons are the cells that transmit information around the body. But how does this work? Is it actual electricity? Like from the wall socket? What is a synapse? What happens there, in between one neuron and...
Catalyst University
Pain Modulation | Gate Control & Endogenous Opioid Mechanisms [TENS/IFC]
In this video, we explore the two major pain modulation mechanisms in TENS and IFC: gate control and endogenous opioid theories.
Professor Dave Explains
Types of Tissue Part 4: Nervous Tissue
We've learned about epithelial tissue, connective tissue, and muscle tissue, so now it's time to learn about the fourth and final type, nervous tissue! That means all the neurons that send signals around your body. These make up the...
Curated Video
032 Visual Processing in the Retina
In this episode, I talk about the visual processing that happens in the retina, starting with the rods and cones, going to the bipolar cells and then the ganglion cells. Watch to learn how this process works.
Curated Video
015 Saltatory Conduction
In this video, I look at Saltatory conduction and explore how it is responsible for moving the action potential quickly along the axon and down to the axon terminals. See how the Myelin Sheaths influence the speed of propagation.
Curated Video
012 The Absolute and Relative Refractory Periods
When can an axon be restimulated to produce an action potential? After the Absolute Refractory Period has finished. It's possible to cause another action potential during the relative refractory period, but it takes a stronger stimulus....
Curated Video
024 @Nicodube23 How Myelin Sheaths speed up the Action Potential
In episode 24, I respond to Nicodube23's question on How the Myelin Sheaths speed up the Action Potential through the process of Saltatory Conduction. Watch, learn and Enjoy!
Curated Video
017 Two Types of Receptors
In this video I talk about the two types of receptors - the ionotropic and metabotropic receptors and show how the result in different types of responses. Enjoy!
Curated Video
013 A Review of the Action Potential
Depolarization, repolarization, hyperpolarization - It's all here. Watch this for a review of the action potential.
Curated Video
014 The Journey Down the Axon
How does the signal that starts at the axon hillock travel down the axon, and why does it only go in one direction?
Curated Video
016 The Release of Neurotransmitter
When the action potential reaches the axon terminal, this triggers a series of events that result in the release of neurotransmitter to the synaptic cleft. Neurotransmitters bind to the receptors on the postsynaptic membrane causing a...
Curated Video
019 What is Summation (2 Types)
In this video, I discuss the topic of summation. It covers both temporal and spatial summation, dealing with how it can result in the addition of PSPs to result in an action potential. Enjoy!
Curated Video
020 Facilitation
In this episode, I talk about the concept of facilitation and explain how it results in a stronger signal in the postsynaptic cell.
Curated Video
041 An Introduction to Skeletal Muscle Contraction
In this episode, I start talking about skeletal muscle contraction, by giving a general introduction into how muscle contraction happens. I deal with how the action of actin and myosin in the sarcomere results in movement. Enjoy!
Curated Video
The Action Potential in All Its Glory - A Review/Summary
What does it take for an action potential to take place? What are depolarization, repolarization, and hyperpolarization? How are voltage-gated ion channels involved? In this video, you will get answers to all these questions.
Curated Video
002 An Introduction to Neurons
BioVid Episode 2 - An Introduction to Neurons. In this video, I talk about what a neuron is, the parts of a neurons and then talk about the three types of neurons.
Curated Video
007 What is an action Potential
In this episode, I answer a question that is fundamental to our understanding of the nervous system. That question is - What is an action potential/nerve impulse. Action potentials are the signals that are sent throughout the nervous...
Curated Video
008 The All-or-None Action Potential
In this episode, I talk about the all-or-none nature of the action potential. Action potentials/nerve impulses either happen or they don't. If the stimulus is strong enough to cause the membrane potential to reach threshold, this will...
Curated Video
009 Depolarization: Phase 1 of the Action Potential
In this video, I talk about the first phase of the action potential - Depolarization. In order for the action potential to take place, the stimulus needs to be strong enough to bring the membrane potential at the axon Hillock to...
Curated Video
010 Repolarization: Phase 2 of the Action Potential
The second phase of the Action Potential is Repolarization. Voltage-gated Potassium channels open and Potassium leaves the cell making the membrane potential more negative.
Neuro Transmissions
What Are Oligodendrocites?
Oligodendrocytes are overwhelming! Join Alie Astrocyte as she explains why the glial cell known as the oligodendrocyte is so important, and why myelin sheaths matter.
Curated Video
The Power of Practice: Building Muscle Memory and Brain Training
This video discusses the concept of muscle memory and how it can be achieved through repetition and a positive attitude. It highlights the importance of practicing skills in various fields, such as sports, music, business, and medicine....