Anatomy and Physiology
This is the heavy bone case that protects the brain.
What is the skull?
There are two main types of blood cells, but only this kind of blood cell gets involved in the immune system.
What are white blood cells?
The prefix "cardio" in the name cardiovascular refers to this important part of the system.
What is the heart?
This is the biggest and most important part of the nervous system, and it also consumes a large part of a person's sugar and oxygen intake.
What is the brain?
The digestive system technically begins with this important orifice in the face where teeth help break down food, and the tongue helps package food into chunks that can be squeezed down the esophagus.
What is the mouth?
This is the longest and strongest bone in the human body.
What is the femur?
These are specific proteins that stick to viruses or bacteria to mark them for attack by the immune system.
What are antibodies?
Usually measured in beats per minute, this important vital sign can show if someone's heart is working normally, as well as how they respond to exercise or excitement.
What is heart rate or pulse?
These are the basic types of cells that make up almost all of the nervous system.
What are neurons?
This powerful liquid in the human stomach helps dissolve and digest food, but its most important job is to help disinfect food before it enters the small intestine.
What is stomach acid?
Humans have two of these large balloon-like organs that fill up with air and transfer oxygen into the blood.
What are lungs?
This is what happens when something that is not usually a threat to the body triggers an immune response.
What are allergies or an allergic reaction?
The heart pumps blood in two loops - the first loop sends blood here, but the second, much larger loop sends blood all over the body.
What are the lungs?
The nervous system also includes many types of sense organs in the skin that help create this important part of the "five senses."
What is touch?
The most important work of digestion, where most of the body's absorption of nutrients happens, is in this part of the digestive system that comes next in the path after the stomach.
What is the small intestine?
There are three main types of this tissue, but most of them connect to bones and help the body move by flexing or shortening and pulling on a bone.
What are muscles?
This viral disease is dangerous to people because it attacks the immune system, but it doesn't usually kill people. People who die from this disease usually die from other things that a healthy immune system can protect them from.
What is AIDS?
Blood is mostly made of this with lots of blood cells floating in it.
What is water?
There are two main types of neurons that are found outside the brain - sensory neurons that carry messages to the brain, and these neurons that carry messages away from the brain.
What are motor neurons?
These are special muscles that act like one-way doors between the parts of the digestive system.
What are sphincters?
Humans have tens of thousands of miles of these tiny blood vessels where nutrients are exchanged between your cells and your blood.
What are capillaries?
This is a kind of disease like Lupus or Multiple Sclerosis where the body attacks itself, and the immune system actually causes the problems that make the disease dangerous.
What is autoimmune disease?
This is the largest of the four chambers of the human heart, and it pushes blood through the entire body.
What is the left ventricle?
This is the base of the brain where it directly connects to the spinal cord, and it controls most of the body's vital functions, such as breathing and heart rate.
What is the brain stem?
This organ helps the body digest oils and fats through storing and secreting bile.
What is the gall bladder?