Secretions from which of the following areas of the cortex cause Cushing disease?
a. adrenal medulla
b. zona fasciculata
c. zona glomerulosa
d. zona reticularis
Ans: b. zona fasciculata
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A(n) __________is an environmental agent that causes changes in DNA structure.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. The lungs are composed of five lobes: three in the left lung and two in the right lung. 2. Surfactant is a slippery fluid that allows the lungs to rub against the chest wall with very little friction. 3. A pneumothorax can result in a collapsed lung. 4. The respiratory system needs to exist because most of our body cells are not in contact with the air. 5. The main function of the diaphragm is to increase the air pressure in the chest cavity.
The ventricles completely empty when they contract in systole.
Answer the following statement true (T) or false (F)
The P wave on the ECG indicates __________.
a. the contraction of the atria b. the electrical events spreading out over both atria c. the spread of the electrical events down the interventricular septum d. the spread of the electrical events over both ventricles