Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Heart
|
An organ that contracts and pumps blood throughout the body. Rhythmic contractions of the heart enable blood to be transported throughout the body.
|
|
|
|
Arteries
|
Blood vessels that transport blood away from the heart to the capillaries. Are elastic and thick.
|
|
|
|
Veins
|
1. Return blood to the heart. 2. Are thin and less elastic. 3. Use valves to prevent blood backflow.
|
|
|
|
Capillaries
|
Tiny blood vessels that transport blood from the arteries to veins within the body. They also serve as the location for the exchange of oxygen, carbon dioxide, fluid and nutrients within the body.
|
Connect arteries to veins.
|
|
|
Heart Chambers
|
Four chambers - the right and left atrium and the right and left ventricles.
|
|
|
|
Heart Valves
|
Four valves that prevent the flow of blood back into the heart chambers after contractions. Tricuspid and pulmonary on the right side and mitral and aortic on the left side of the heart.
|
|
|
|
Flow of blood through the heart
|
1. Deoxygenated blood enters the heart through the superior vena cava. 2. Blood travels into the right atrium. 3. During contractions, flows through the tricuspid valve into the right ventricle and picks up oxygen. 4. The oxygenated blood is then carried back to the heart by the pulmonary veins into the left atrium, through the mitral valve and into the left ventricle. 5. Contraction of the left ventricle forces the blood through the aortic valve, through the aorta and out to the entire body.
|
|
|
|
Septum
|
A wall that separates the left and right sides of the heart.
|
|
|
|
Systole
|
The time during which the heart is contracting.
|
|
|
|
Diastole
|
The time during which the heart relaxes.
|
|
|
|
Autorhythmic cells
|
Sinoatrial (SA) node (pacemaker) and the AV node.
|
|
|
|
SA node
|
Responsible for starting the cardiac cycle by contracting both atria and by sending a signal that causes the AV node to signal to contract the ventricles.
|
|
|
|
Blood
|
Composed of plasma, red blood cells, white blood cells and platelets.
|
|
|
|
Red blood cells (erythrocytes)
|
Responsible for carrying oxygen via the hemoglobin present in the cells.
|
|
|
|
White blood cells (leukocytes)
|
Defend the body against foreign invaders such as bacteria and viruses.
|
|
|
|
Platelets
|
Responsible for helping the blood clot and seal breaks in the walls of the blood vessels.
|
|
