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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]
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]
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 for "cardiopulmonary resuscitation."
fitness physical condition, especially the condition of one's muscles and heart. [1/2 definitions]
heartbeat a single complete pumping motion of a heart.
kernel the most basic part of something; the heart of the matter; core. [1/3 definitions]
left1 of, located on, or pertaining to the side of the human body where the heart is located or to the side of any other thing in the same position with respect to its other side; opposite of right. [1/2 definitions]
organ a part of plants or animals that performs a particular task. The heart, the lungs, the skin, and the eyes are all organs of animals. [1/2 definitions]
pacemaker a small electronic device put under the skin to control the heart rate in people with heart problems.
pulse1 the regular beating of the arteries that is caused by the beating of the heart. The pulse can be felt in the wrist or neck. [1/3 definitions]
right of, located on, or pertaining to the side of the human body that is opposite where the heart is or to the side of any other thing in the same position. [2/21 definitions]
stethoscope an instrument that makes the sounds inside a body louder. Doctors and nurses listen to the heart with a stethoscope.
thorax the part of the body between the neck and the abdomen in humans and in animals with four limbs; chest. It contains the ribs, heart, and lungs. [1/2 definitions]