Components in lymph and tissue fluid

Steps:

• Recall tissue fluid forms from plasma leaking through capillaries, excluding red blood cells.
• Note lymph is tissue fluid collected by lymphatic vessels, sharing similar composition.
• Identify shared components: antibodies (plasma proteins), sodium ions (electrolytes), white blood cells (can migrate).
• Confirm absence of red blood cells in both, as they stay in blood vessels.

Why B is correct:

• Lymph and tissue fluid derive from plasma filtrate, containing antibodies, sodium ions, and white blood cells per fluid exchange definitions, but excluding red blood cells confined to capillaries.

Why the others are wrong:

• A: Falsely marks red blood cells as present, which they are not.
• C: Incorrectly excludes antibodies and sodium ions, essential in both fluids.
• D: Wrongly excludes all components, ignoring shared plasma-derived elements.

Final answer: B