Did you know that cells can talk to one another? One cell can send a molecule over to another cell, and a receptor protein in the cell membrane will receive it, just like molecular walkie-talkies. Check it out!

We already learned a little bit about receptors and the signaling pathways that they initiate, but what are the molecules the travel throughout your body, carrying messages like little carrier pigeons? They are called hormones and...

This video provides an explanation of homeostasis. The video discusses the importance of homeostasis, particularly in relation to enzyme action and cell function, and provides examples of homeostasis in the human body, such as the...

Histology of the peripheral mechanoreceptors.

A deeper look at the workings of neurons and neurotransmitters in the context of how the human nervous system works.

Acquiring Immunity - Viruses/Immunity Set - Part 3, This clip offers a step by step look at how the human body develops immunity to infectious diseases.

What is that smell? It smells like an old factory. Oh wait, nope, itês just your olfactory system. We canêt neglect one of our more scent-sitive senses. Our sense of smell not only gives us the ability to distinguish different odors, it...

There are so many critters out there, bacteria and viruses that want to wreak havoc in our bodies. How do we defend ourselves against such tiny threats? The immune system! This is quite possibly the most profoundly remarkable aspect of...

We've learned about one main division of the nervous system, the central nervous system, so let's learn about the other. That's the peripheral nervous system. This is the part that receives information from your surroundings and brings...

There are 3 different types of neuron, or nerve cell; the sensory neuron which detects the signal, the relay or intermediate neuron, and the motor neurons which trigger the response. We will also look at how synapses work; transmitting...

We are able to become physically dependent on a wide variety of substances, which results in what we call drug addiction. What does this look like from a neurophysiological standpoint? What does the drug-addicted brain look like? Let's...

This video tutorial briefly covers the sympathetic and parasympathetic role on bladder innervation. It focuses on the following: - Sympathetic neurotransmitters (epinephrine and nor-epinephrine) and receptors (adrenergic). -...

Your cells have to divide when you're growing, to heal wounds, and to replace dead cells. But how do cells know when to divide and when not to divide? We can't have cells just growing willy-nilly! That's what cancer is, and that's bad....

In this program viewers will learn about the three key components of the nervous system -- the brain, spinal cord and nerves -- all made up of special cells called neurons that transmit electrical impulses throughout the body. They'll...

Most of us know about viruses, and that they spread disease. But what is a virus exactly? Is it alive? How does it infect a host? There's a lot to discuss here! Take a look.