21. Quiet inspiration will thoracic and lung volume and intrapulmonary pressure. A. increase, increase B. increase, decrease C. decrease, increase D. decrease, decrease

B. increase, decrease.

21. Quiet inspiration will increase thoracic and lung volume and decrease intrapulmonary pressure.

Explanation:

Inspiration is the process by which air enters from the outside to the inside of the lungs. The communication of the lungs with the outside is done through the upper airways. Inspiration is the active phase of breathing, for it to occur it is necessary that different muscles contract in order to increase the size of the chest, which causes the lung to expand and atmospheric air tends to enter to equalize the pressure . During inspiration the vertical diameter of the thorax increases due to the decrease in the diaphragm, but the transverse and anteroposterior diameter also increases due to the action of the remaining muscles that raise the ribs.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.