When you think about the body’s infrastructure, you probably think of bones. But what about the heart, the blood vessels, and the lymphatic system? In this episode of Crash Course Biology, we’ll tour the cardiovascular, lymphatic, and...

Hank brings us another simple experiment that demonstrates the important biochemical process of osmosis by turning a chicken egg into a frightening alien-looking thing.

Explore the types of passive and active cell transport with the Amoeba Sisters! Table of Contents: Intro 00:00 Importance of Cell Membrane for Homeostasis 0:41 Cell Membrane Structure 1:07 Simple Diffusion 1:45 What does it mean to "go...

Explore the sodium potassium pump (Na+/K+ pump), with the Amoeba Sisters! This video talks about why this pump is needed and provides an overview of this type of active transport. Table of Contents: 00:00 Intro 0:48 Introducing the...

Join the Amoeba Sisters as they explore the excretory system! This video will first discuss two major functions of the excretory system before focusing on the nephron. The majority of this video will tour through the nephron while...

Explore how substances travel in diffusion with the Amoeba Sisters! This video uses a real life example and mentions concentration gradients, passive transport, facilitated diffusion, and explains why diffusion is critical for all...

Paul Andersen describes how cells move materials across the cell membrane. All movement can be classified as passive or active. Passive transport, like diffusion, requires no energy as particles move along their gradient. Active...

Passive transport includes diffusion, facilitated diffusion, and osmosis, all of which move substances down their concentration gradients without energy input. Small, uncharged molecules like oxygen and carbon dioxide diffuse freely,...

Passive transport is a naturally occurring phenomenon that allows us to keep things balanced in our cells. Simple diffusion, facilitated diffusion and osmosis are known types of passive transport.

Learn about “osmosis” by making a rubber egg! Then stick around for the 2 bonus experiments. And you won’t want to miss the surprise ending!!! 0:00 – Introduction of the lesson 0:23 – What you need 0:44 – Explanation of Osmosis 2:38 –...

A layer in the Earth's atmosphere at 13 to 20km altitude with an unusually high concentration of ozone gas.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and...

The uppermost 5 to 20cm of soil, with a high concentration of organic matter and microorganisms, where almost all of the biological activity in soil takes place.
<

br/>

A Twig Science
Glossary Film.
Key scientific...

How does a tall tree draw water from its roots to its leaves? And how does food made in leaves reach the rest of a plant? Discover how plants transport resources via the xylem and phloem. Biology - Plants - Learning Points. Transpiration...

Journey inside the cell to see how the cell membrane acts as both a barrier and an entrance. How does it take in nutrients while keeping out potentially damaging molecules? Biology - Cells And DNA - Learning Points. The cell membrane...

The movement of water from a less concentrated solution to a more concentrated one, through a partially permeable membrane. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise...

This brief video tutorial briefly discusses cell membrane transport: 0:00​​. Introduction 0:15. Permeability of cell membrane 2:57. Diffusion - 3:08. Simple diffusion - 3:37. Facilitated diffusion (ion leak channels, voltage gated...

This brief video tutorial briefly discusses voltage-gated sodium channels: 0:00​​. Introduction 0:14. Structure (activation gate and inactivation gate) 1:09. Three conformational states: - 1:24. 1. Closed - 2:30. 2. Open - 3:54. 3....

This video tutorial discusses an Introduction to Histology (study of tissues): 0:00​. Intro 0:35. Hierarchical organization of living matter 1:56​. H&E stains 3:00​. Epithelium overview (characteristics and classifying scheme) - 9:12....

This video provides an explanation of what diffusion is, how it occurs, and how to change the rate of diffusion. The concept of diffusion is demonstrated through the example of a plate of food emitting a smell that travels across a room....

Biosignaling - G-protein-coupled Receptors PLC, DAG, & IP3

Fick's First Law (1): Diffusion, Flux, and Concentration Gradients

Next up for animal phyla is Cnidaria! This phylum contains jellyfish, sea anemones, corals, and all kinds of other organisms. This one is pretty meaty so it will take several tutorials. Let's start by getting through some information...

Polyol Pathway and Role in Diabetes Pathogenesis lesson. What is the purpose of the Polyol (Sorbitol-Aldose Reductase) Pathway, and what is the role of the polyol pathway in diabetes pathogenesis? Here, I explain what the actual function...

Hemoglobin Function Haldane Effect