Question

multiple select question
select all that apply
choose all in which capillary reabsorption exceeds capillary filtration. more than one answer may be correct.

• capillaries in active muscles
• capillaries in resting tissue
• glomeruli in the kidneys
• alveolar capillaries in the lungs

Explanation:

1. Capillaries in active muscles: During muscle activity, metabolic demands increase, leading to increased capillary filtration (due to factors like increased hydrostatic pressure) to supply nutrients and remove waste. Reabsorption does not exceed filtration here.
2. Capillaries in resting tissue: In resting tissues, the balance between filtration and reabsorption is such that reabsorption (driven by oncotic pressure) can exceed filtration, as the tissue's metabolic needs are lower, and fluid tends to be reabsorbed back into capillaries.
3. Glomeruli in the kidneys: Glomerular capillaries have high hydrostatic pressure to facilitate filtration (formation of filtrate for urine production), so filtration exceeds reabsorption here.
4. Alveolar capillaries in the lungs: In pulmonary capillaries, the oncotic pressure gradient and the need to maintain fluid balance in the alveoli lead to reabsorption exceeding filtration (to prevent alveolar flooding).

Answer:

B. Capillaries in resting tissue, D. Alveolar capillaries in the lungs