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CDC 1-2

Heart structure

QuestionAnswer
The right and left sides of the heart are divided by a wall called the _____. septum
The valve between the left atrium and left ventricle is the _____. mitral (bicuspid) valve
The valve between the right atrium and right ventricle is called the ______. tricuspid valve
A third valve called the _____ is located between the left ventricle and the aorta. aortic valve
The fourth valve leads from the right ventricle to the pulmonary artery. This valve is called the _____. pulmonary valve
Adults have approximately __ liters of blood in their body. 5
In a blood sample, __ percent of the sample is plasma and the other __ percent is blood cells. 55 & 45
The percentage of cells is called the _____. Ninety-nine percent of these cells are RBCs, while the remaining one percent is WBCs and platelets. hematocrit or packed cell volume
RBCs contain a substance called hemoglobin. Hemoglobin is the portion of the blood that contains oxygen and gives the blood its red color. Red blood cells (erythrocytes). Approximately one million new RBCs are produced by the bone marrow every second. They live for 3 to 4 months. As the RBCs become old, the liver and spleen destroy them.
These are colorless cells that protect the body against infection. When an infectious agent invades the body, WBCs reproduce very rapidly to combat the infection. White blood cells (leukocytes). This is why a high WBC count detected in a blood test is a good indication of the presence of some type of infection. WBCs are also produced by the bone marrow. They live for about 9 days.
Platelets are responsible for the blood’s clotting action. They are produced by the bone marrow and live for approximately 4 days. Platelets (thrombocytes)
_____ is the sticky liquid portion of the blood, which consists mostly of water. The function of the _____ is to transport the blood cells throughout the circulatory system. Plasma. Plasma also carries other nutrients and chemical substances throughout the body and transports waste products.
The pressure that blood exerts against the walls of the arteries during the pumping (systole) action of the heart is called the _____ blood pressure. systolic
When the heart muscle rests between each contraction (diastole), the pressure that remains in the system is known as the _____ blood pressure. diastolic
Created by: jhey33