Question

the human lung is a complex organ, containing all of the structures listed below except the
trachea.
capillaries.
bronchioles.
alveoli.
question 25
1 pts
if the glomerulus remained intact but other capillaries were not in close physical contact with nephrons, which of the following functions would not be lost?
secretion of toxins
concentration of urine
reabsorption of water and sugars
filtration of plasma

Explanation:

First Question (About Human Lung Structures)

To solve this, we analyze each structure:

• Capillaries: Present in lungs (around alveoli for gas exchange).
• Bronchioles: Part of the lung's airway tree, branching into alveoli.
• Alveoli: Tiny air sacs in the lung, site of gas exchange.
• Trachea: Connects larynx to bronchi, located outside the lung (it's the windpipe leading to the lungs, not a structure within the lung itself). So the lung does not contain the trachea.

We analyze each function:

• Secretion of toxins: Occurs in renal tubules with capillary contact (peritubular capillaries), so would be lost.
• Concentration of urine: Depends on countercurrent mechanism and capillary (vasa recta) contact, so would be lost.
• Reabsorption of water and sugars: Happens in tubules with capillary (peritubular) contact, so would be lost.
• Filtration of plasma: Occurs in the glomerulus (a capillary tuft). Since the glomerulus is intact, plasma filtration (which is the first step of urine formation, driven by glomerular capillaries) would still occur. So filtration of plasma is the function not lost.

Answer:

A. trachea

Second Question (Nephron and Capillary Functions)