Diaphragm

Q. The structure that encloses the thoracic cavity of mammals at the bottom is made up of:

1. Longitudinal muscle
2. Circular muscle
3. Elastic cartilage
4. Radial muscle

Q. Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

1. One can breathe out air totally without oxygen.
2. One can breathe out air through Eustachian tube by closing both nose and mouth.
3. One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all.
4. The lungs can be made fully empty by forcefully breathing out all air from them.

Q.

The figure shows a diagrammatic view of the human respiratory system with labels. Select the option that gives the incorrect identification and main function or characteristic.

1. Visceral pleura - Outermost membrane

2. Parietal pleura - Innermost membrane

3. Pleural cavity - The pleural fluid fills this space

4. Diaphragm - Dome-shaped muscle that contracts to increase the volume of the thoracic cavity.

Q. Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

1. One can breathe out air totally without oxygen.
2. One can breathe out air through Eustachian tube by closing both nose and mouth.
3. One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all.
4. The lungs can be made fully empty by forcefully breathing out all air from them.

Q. Which of the following structures divides the thoracic region from abdominal region?

1. Sternum
2. Mediastinum
3. Pulmones
4. Diaphragm

Q. The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and/or characteristic.

1. C - Alveoli - Thin-walled vascular bag-like structures for exchange of gases.
2. D - Lower end of lungs - Diaphragm pulls it down during inspiration.
3. A - Trachea - Long tube supported by complete cartilaginous rings for conducting inspired air.
4. B - Pleural membrane - Surround ribs on both sides to provide cushion against rubbing.