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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. A vesicle is involved in the transport of substances within or out of the cell via processes like endocytosis or exocytosis but does not directly permit ion passage across the membrane.
B. An enzyme catalyzes chemical reactions and is not directly involved in the transport of ions across the cell membrane.
C. A channel protein facilitates the passage of ions across the cell membrane, allowing specific ions to move in and out of the cell based on concentration gradients.
D. A lysosome is an organelle responsible for digesting and breaking down waste materials within the cell, not for ion transport across the membrane.
Correct Answer is B
Explanation
A. While phagocytes move to areas of infection or damage, their primary role is not clumping together and adhering to tissues but rather engulfing and digesting foreign particles.
B. Phagocytes, such as neutrophils and macrophages, are white blood cells that ingest and digest foreign pathogens, dead cells, and debris in damaged tissues. This is their primary function in the immune response.
C. Releasing histamine is the function of mast cells, not phagocytes. Histamine is involved in initiating inflammation, but phagocytes are focused on clearing pathogens and debris.
D. Transporting oxygen is the function of red blood cells, not phagocytes. Phagocytes are involved in immune defense, not in the transport of oxygen.
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