What is blood? Blood, by definition, is a fluid that moves through the vessels of a circulatory system. In humans, it includes plasma (the liquid portion), blood cells (which come in both red and white …

Spin down your blood and find out what it's made up of. This video provides a detailed look at the composition of blood, explaining the roles of plasma, white blood cells, and red blood cells.

The first step in making urine is to separate the liquid part of your blood (plasma), which contains all the dissolved solutes, from your blood cells. Each nephron in your kidneys has a microscopic filter, …

Blood is about 45% cells and 55% plasma, so the adage “blood is thicker than water” holds true in scientific terms! Learn more about how this system works in these videos.

They help regulate blood flow in the brain, maintain the composition of the fluid that surrounds neurons, and regulate communication between neurons at the synapse.

This video is about composing functions, which is the process of building up a function by composing it from other functions. It explains how to evaluate the composition of functions step by step, using …

Structure and function of the plasma membrane and cytoplasm of cells. Also covers the phospholipid bilayer and microvilli.

Smooth muscle is involuntary and non-striated. It is found in the hollow organs of the body, such as the stomach, intestines, and around blood vessels. Cardiac muscle is involuntary and striated. It is found …

Because in the rest of the body when we're going away from the heart or we're talking about arteries, you're going to see that that's oxygenated blood, while when we're going away from the heart to the …

We can compose functions by making the output of one function the input of another one. This simple-yet-rich idea opens up a world of fascinating applications. Inverse functions undo each other when …