| ace |
An ace is a playing card that shows only one symbol in the middle. For example, a card that has just one heart in the middle, is an ace. [1/2 definitions] |
| ache |
When your heart aches for someone, it means that you are sad because they have trouble or pain. [1/4 definitions] |
| aerobic |
able to work the heart and lungs to help the body use oxygen better. |
| aerobics |
(used with a singular or plural verb) a form of exercise that works the heart and lungs to help the body use oxygen better. Running, swimming, biking, or dance are forms of aerobics. |
| aorta |
the main artery of the body. The aorta carries blood from the left side of the heart to all parts of the body except the lungs. |
| artery |
a blood vessel that carries blood away from the heart. [1/2 definitions] |
| atrium |
either of the two upper compartments of the heart; auricle. Blood returning from the body flows into the atria, which pump the blood to the ventricles, the lower compartments of the heart. [1/2 definitions] |
| auricle |
part of the heart. See "atrium." [1/2 definitions] |
| beat |
When your heart beats, it moves in way that pumps blood out into the body. When it beats, it makes a dull noise. Your heart usually beats in a regular rhythm but sometimes it speeds up and sometimes it slows down. [1/7 definitions] |
| blood |
Blood is the red liquid that your heart sends out through your body. Without enough blood, we cannot live. When you eat food, the things that your body needs from the food go into your blood. The blood brings these things to all the parts of your body. This is one reason why blood is important. [1/2 definitions] |
| caffeine |
a bitter substance found in coffee, tea, chocolate, and some sodas. Caffeine stimulates the heart and nervous system and can cause a person to stay awake and alert. |
| callous |
not having kindness; not sensitive; having a hard heart. [1/2 definitions] |
| checkup |
If you go to the doctor for a checkup, the doctor will look at you and do some things to see how healthy you are. The doctor listens to your heart, looks into your mouth and ears, measures your height and weight, and does some other things. |
| chest |
Your chest is the front part of your body between your neck and your stomach. Your heart and lungs are inside your chest. [1/3 definitions] |
| circulatory |
of or pertaining to the circulatory system, the system of bodily organs, including the heart, arteries, and veins, that send blood and lymph throughout the body and return it to the heart. |
| circulatory system |
a system in the body made up of the heart, blood vessels, blood, and lymph vessels that carries blood and lymph around the body. |
| cockle |
a small animal with a soft body and a hard shell shaped like a heart. Cockles are mollusks with two hinged shells that open and close. They are kinds of clams. People sometimes eat cockles. |
| CPR |
a method of reviving heart attack victims by breathing into the mouth and applying strong, rhythmic pressure to the chest. "CPR" is an abbreviation of "cardiopulmonary resuscitation." |
| excite |
to stir the emotions of, usually causing the heart to beat faster through expectation, fear, anger, or happiness. |
| excitement |
Excitement is a feeling or display of strong emotion. If you feel excitement about something, you might jump up and down about it, or maybe you can't sleep because of it. Excitement is often a very happy feeling about something that is going to happen, but sometimes it is a feeling of being scared or nervous. Excitement makes your heart beat faster. [1/2 definitions] |
| exciting |
Things that make your heart beat fast are exciting. Things like skiing down a mountain, going up in a balloon, or watching an action movie can be exciting. Often, things that are exciting are things that people enjoy, but sometimes they can make people scared or very nervous. Many exciting things are both fun and scary. |