In contrast to inhalation, exhalation: Select one: a. is an active process caused by decreased intrathoracic pressure. b. occurs
when the diaphragm lowers and expels air from the lungs. c. is a passive process caused by increased intrathoracic pressure. d. requires muscular effort to effectively expel air from the lungs.
C. is a passive process caused by increased intrathoracic pressure.
Explanation:
Inhalation is an active process as it includes the contraction of muscles and diaphragm. Exhalation is a passive stage of breathing. It does not include any muscular contraction. Rather, diaphragm and the external intercostal muscles become relaxed. This reduces the volume of the thoracic cavity and lungs. The reduced volume causes increased air pressure in alveoli as compared to the atmospheric pressure. The increased pulmonary pressure drives the movement of air towards the outside of the body.
Amino acids are considered as the building blocks of proteins.
Proteins in the body consist of 20 different amino acids, some of which can be synthesized by the body itself. Each unique protein is formed by the combination of these proteins in several ratios and sequences.
