The circulatory system review
|Circulatory system||The body system responsible for carrying blood, nutrients, and waste throughout the body|
|Cardiac||Related to the heart|
|Pulmonary||Related to the lungs|
|Artery||Blood vessel that moves blood away from the heart|
|Vein||Blood vessel that moves blood toward the heart|
|Aorta||Major artery that carries blood to the systemic circulatory system|
|Capillary||Small blood vessel that allows nutrient exchange|
|Atrium||Upper chamber of the heart|
|Ventricle||Lower chamber of the heart|
The circulatory system
- The pulmonary circuit provides blood flow between the heart and lungs.
- The systemic circuit allows blood to flow to and from the rest of the body.
- The coronary circuit strictly provides blood to the heart (not pictured in the figure below).
Blood and blood vessels
Common mistakes and misconceptions
- Arteries usually carry oxygenated blood and veins usually carry deoxygenated blood. This is true most of the time. However, the pulmonary arteries and veins are an exception to this rule. Pulmonary veins carry oxygenated blood towards the heart and the pulmonary arteries carry deoxygenated blood away from the heart.
- Blood is always red. Veins can appear blue as we see them through our skin, leading some people to believe that deoxygenated blood is blue. However, this is not the case! Blood only appears blue because of the way tissues absorb light and our eyes see color. Although oxygen does have an effect on the brightness of the blood (more oxygen makes a brighter red, less makes it darker), blood is never actually blue.