Q. No.All the following changes occur in the circulatory system when a fetus is delivered and begins to breathe on its own for the first time except:
1. the rate of blood flow through pulmonary circulation decreases
2. the foramen ovale closes
3. the ductus arteriosus closes
4. the resistance to blood flow through the lung decreases
1. the rate of blood flow through pulmonary circulation decreases
2. the foramen ovale closes
3. the ductus arteriosus closes
4. the resistance to blood flow through the lung decreases
“Bends” is a painful condition that is seen in cases of:
1. nitrogen narcosis
2. decompression sickness
3. hyperbaric oxygen therapy
4. carbon dioxide accumulation
Overinflation of lungs can be damaging and is prevented in humans by:
1. apneustic center
2. Hering-Breuer reflex
3. hypercapnia
4. inspiratory neurons
Oxidized hemoglobin is known as:
1. carboxyhemoglobin
2. methemoglobin
3. oxy hemoglobin
4. carbaminohemoglobin
Alveoli are tiny, balloon-shaped air sacs that sit at the very end of the respiratory tree, branching off the _______.
| 1. tertiary bronchi | 2. bronchioles |
| 3. terminal bronchioles | 4. respiratory bronchioles |
The cells lining the alveoli that secrete the pulmonary surfactant are:
1. type I alveolar cells
2. type II alveolar cells
3. filtration from the alveolar capillaries
4. alveolar macrophages
A measure of the amount of air a person inhales during a normal breath is:
| 1. inspiratory reserve volume | 2. vital capacity |
| 3. total lung capacity | 4. tidal volume |
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2,3-diphosphoglycerate in red blood cells:
1. enhances oxygen unloading at the systemic capillaries
2. makes deoxyhemoglobin less stable
3. shifts the oxyhemoglobin dissociation curve to the left
4. stimulates the production of more red blood cells
Four globin chains [ 2 alpha and 2 gamma] constitute the structure of:
1. hemoglobin A
2. hemoglobin F
3. hemoglobin S
4. methemoglobin
The abnormal hemoglobin seen in patients of sickle cell anemia is HbS. It is different in structure from the normal HbA because:
| 1. | glutamic acid is replaced by valine in the beta chain |
| 2. | the two beta chains are replaced by gamma chains |
| 3. | it has two heme groups instead of four |
| 4. | it consists of only a single globin chain and heme |
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