Respiration and Gas Exchange

ICU stands for Intensive Care Unit, which is correct. Options A, B, and C all have grammatical errors ('cared' instead of 'care', 'intensed' which is not a proper word). Option D has the correct spelling and capitalization.

CPR stands for Cardio Pulmonary Resuscitation. It is an emergency procedure combining chest compressions with artificial ventilation to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest.

Not all air in the lungs is exchanged with each breath. Even after forceful exhalation, about 1 liter of air (residual volume) remains in the lungs to keep alveoli inflated for gas exchange.

The average resting respiratory rate for adults is 12-20 breaths per minute, which would total approximately 17,000-29,000 breaths per day. The stated 23,045 falls within this physiological range, though the precision suggests specific measurement rather than average.

Humans have two lungs - a right lung and a left lung. The right lung has three lobes while the left has two (making space for the heart). This is basic human anatomy.

The claim is false - the right lung is actually larger and takes in MORE air than the left. The right lung has three lobes while the left has only two (the left lung is smaller to accommodate the heart), so the right lung has greater capacity.

When the diaphragm rises (during exhalation), it creates pressure in the chest cavity that causes the lungs to contract and push air out. The diaphragm is a dome-shaped muscle - when it contracts and flattens, lungs expand; when it rises and relaxes, lungs contract. This is the opposite of what many students intuitively expect.

Perspiration (sweating) is the body's main cooling mechanism - as sweat evaporates from the skin, it removes heat and helps regulate body temperature. Respiration is for breathing, mastication is chewing, and urination is for eliminating waste.

An open airway allows oxygen to reach the lungs and carbon dioxide to be expelled, which is essential for sustaining life. The other options are secondary concerns - preventing injury is important but not the purpose of an airway, while an open airway doesn't directly cause regaining consciousness or stop vomiting.

Pneumonia is an inflammatory condition of the lungs primarily affecting the alveoli (air sacs). It causes these tiny air sacs to fill with fluid or pus, leading to symptoms like cough, fever, and difficulty breathing. The lungs are the primary organ affected, not the liver, intestine, or kidneys.

The lungs are located in the thoracic cavity (chest cavity), which is bounded by the ribs, sternum, and vertebral column. The thoracic cavity is separated from the abdominal cavity below by the diaphragm. The pericardial cavity contains only the heart, the buccal cavity is the mouth cavity, and the abdominal cavity contains digestive organs. The thoracic cavity houses both lungs and the heart.

The claimed answer C (Yes) is correct. The left lung is smaller than the right lung because the heart is positioned on the left side of the chest cavity, occupying space that would otherwise be part of the left lung. The left lung has only two lobes compared to the right lung's three lobes. Option D (May be) is vague, while A and B are incorrect.