In which of the following respiratory system components does gas exchange occur?
Respiratory bronchioles
Alveolar sacs
Pleura
Pulmonary veins
The Correct Answer is B
A. Respiratory bronchioles are part of the lower respiratory tract and lead to alveolar sacs, but they themselves are not primarily responsible for gas exchange. Their role is in the conduction of air.
B. Alveolar sacs are the primary site of gas exchange in the lungs. These sacs contain alveoli, where oxygen and carbon dioxide are exchanged between the air and the blood. This is the correct answer.
C. The pleura are double-layered membranes surrounding the lungs and do not play a direct role in gas exchange. They reduce friction and allow for smooth lung expansion.
D. Pulmonary veins carry oxygenated blood from the lungs back to the heart, but gas exchange occurs in the alveolar sacs, not the veins.
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Related Questions
Correct Answer is D
Explanation
A. Hydrochloric acid is a strong acid produced in the stomach to aid in digestion, not a byproduct of glucose breakdown.
B. Ketotic acid is produced in conditions where fat metabolism predominates, especially during ketosis, not during anaerobic glucose breakdown.
C. Carbonic acid forms when carbon dioxide dissolves in water and is not related to glucose metabolism.
D. Lactic acid is produced during anaerobic respiration when glucose is broken down without sufficient oxygen. This occurs in muscles during intense exercise, leading to the accumulation of lactic acid, which causes the sensation of muscle fatigue. This is the correct answer.
Correct Answer is A
Explanation
A. The spleen is a key component of the lymphatic system. It filters blood, removes old or damaged blood cells, and plays a role in immune function by storing white blood cells that fight infection.
B. The thyroid gland is an endocrine gland involved in regulating metabolism through the production of thyroid hormones, but it is not part of the lymphatic system.
C. The adrenal glands are also endocrine glands responsible for producing hormones like adrenaline and cortisol. They are not part of the lymphatic system.
D. The pancreas is an organ involved in digestion and blood sugar regulation through insulin production. It does not function within the lymphatic system.
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