Journey to the Microcosmos
This Ciliate Is About to Die
It's time to explore a big question while we watch a ciliate go through its last moments.
Curated Video
Active Transport: Moving Substances Against Concentration Gradient
This video explains the concept of active transport, which is the movement of substances from a more diluted concentration to a more concentrated concentration against a concentration gradient. The video provides examples of active...
JJ Medicine
Ras Raf MEK ERK Signaling and the mTOR Pathway | Interactions and Regulation
Lesson on interactions between the Ras Raf MAPK and mTOR signaling pathways. Ras Raf MAPK and mTOR pathways have similar but distinct functions within the cell. During cell proliferation and growth, activation of these pathways is...
Catalyst University
NEW! Hexokinase Physiology, Biochemistry, and Mechanism
NEW! Hexokinase Physiology, Biochemistry, and Mechanism
Schooling Online
Biology Cells as the Basis of Life: Cell Structure - Plant Cells Part 3
Sadly, it’s their last day in the Garden of Babylon. But nothing cheers up Sally like a shopping spree! The class is off to buy souvenirs before they say farewell to this wonderful city. This lesson will conclude our introduction to the...
Curated Video
Cell Specialization: How Different Cells are Adapted to Their Functions
The video discusses cell specialization, explaining how cells are structured differently to suit their functions. Three types of specialized cells are examined, including sperm cells, egg cells, and ciliated epithelial cells. The video...
Catalyst University
Physiology of Mechanism of Natural Killer (NK) Cells
Here, we answer what are natural killer (NK) cells and how they perform immunological surveillance.
Curated Video
Diffusion: How Substances Move In and Out of Cells
This video explains how substances move in and out of cells via diffusion, which is the net movement of particles from an area of high concentration to an area of low concentration. The video first defines diffusion and illustrates it...
Schooling Online
Biology Cells as the Basis of Life: Cell Structure - Plant Cells Part 2
Sally’s field trip to the Garden of Babylon is turning into a road trip. Her first stop is the post office. It’s not every day that a stork delivers your mail! This lesson will continue unearthing the structure of plant cells, focusing...
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...
Curated Video
Factors Affecting Diffusion and Impact on Organisms
This video discusses the concept of diffusion in biology, with a focus on what affects the rate of diffusion and its impact on organisms. The video explains that the rate of diffusion is affected by the concentration gradient,...
Catalyst University
Overview & Comparison of Water- vs Lipid-Soluble Hormones
This video includes a basic introduction to the endocrine system and then a comparison of the signaling between water-soluble and lipid-soluble hormones.
Professor Dave Explains
Signal Transduction in Immune Cells: Receptor-Ligand Interactions
Now that we know some things about immune cell structure and function, we need to start understanding how these cells interact on the molecular level, and how signals are translated into cellular response. This means looking at...
Journey to the Microcosmos
The Many Ways Microbes Eat, Get Eaten, and Poop | Compilation
This is a world where microbes are both residents and food, which means that occasionally, we’ll have to spend our time together watching organisms, whose bodies are fractions upon fractions upon fractions of a millimeter in size, turn...
Journey to the Microcosmos
Stentors Single-Celled Giants
It's time to meet a single-celled organism that is bigger than a tardigrade! We'll learn how Stentors reproduce, why they look like trumpets, and why some of them are just SO BLUE!
Institute of Human Anatomy
The Importance of Vitamin C for Your Body: From Scurvy to Immune System Support
This video explains the importance of vitamin C in the body, including its role as a powerful antioxidant and its association with scurvy. It also discusses how vitamin C is absorbed and excreted in the body, and its essential role in...
Ancient Lights Media
Signal Transduction: Light Induced Cellular Change
Plant Physiology and Chemistry Set: 6. This clip shows how, by the process of signal transduction, light is able to bring about chemical responses that result in the expression of genes.
Curated Video
Introduction to the Endocrine System and Negative Feedback Control
In this lecture, I discuss the endocrine system and how endocrine glands control functions in the body through the release of hormones. The pituitary gland is known as the Master Endocrine Gland and plays a major role in controlling the...
Curated Video
Red Blood Cell Structure and Function | Anatomy and Physiology
Red Blood Cells are unique cells. And in this video, we talk about their structure and function. Learn about their biconcave shape, the missing organelles, details about hemoglobin and gas exchange.
Curated Video
004 Ion Channels: Proteins in the Membrane of Neurons
In this video, I go through the details of the 4 types of proteins in the membrane of neurons: The passive/leakage ion channels, Sodium Potassium pump, Voltage-gated ion channels and ligand-gated ion channels
JJ Medicine
AKT Signaling Pathway: Regulation by the Insulin Signaling Cascade
Lesson on the Insulin Signaling Pathway and its Regulation of the AKT Pathway. The insulin signaling cascade is activated upon binding of insulin to the insulin receptor. Afterwards, downstream targets, including IRS1/2, become...
The Noted Anatomist
Endocrine system overview
This video tutorial provides an overview of the endocrine system (function, definitions, hormone classification and mechanism of action, target cell specificity, negative feedback). 0:00. Introduction 0:28. Nervous system vs. Endocrine...
Schooling Online
Biology Cells as the Basis of Life: Cell Structure - Animal Cells Part 1
Sally’s never-ending field trip continues. This time, they’re exploring the bustling city of Zoo York. Perhaps she’ll travel for the rest of year 11, only returning home for a hot meal and special occasions. This lesson will examine the...
Curated Video
Bacteria: Similarities and Differences Compared to Animal and Plant Cells
This is a short lecture presentation on bacteria. The video discusses the similarities and differences between bacteria and animal and plant cells, and looks at a particular example of the bacterium, cholera. The video then goes into...