If the cusps of an atrioventricular valve are damaged or too short to meet at the center of the valve or do not close completely during the normal point in the pumping cycle, blood may flow backwards. This is called ________.
Fill in the blank(s) with the appropriate word(s).
regurgitation
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What painkilling and mood enhancing compounds are released during prolonged exercise, such as jogging?
a. endorphins b. enkephalins c. dynorphins d. substance P e. alcohols
Each myofibril consists of approximately ________ sarcomeres.
A) 10 B) 500 C) 10,000 D) 100,000 E) 2-3 million
Answer the following statements true (T) or false (F)
1. The word “articulation” is another word for joint. 2. The interaction between muscle and bone allows the body to move. 3. The function of hematopoiesis is accomplished in the osteon of the bone. 4. In the adult skeleton, the function of hematopoiesis occurs in the medullary canal. 5. Between the two diaphyses of a long bone is the epiphysis.
The ________ is sometimes called the expiratory center.
Fill in the blank(s) with the appropriate word(s).