alleryStart learning →How does albumin act on the movement of water across blood vessel walls?
AIt draws water into the bloodstream
BIt drives water out into the tissues
CIt has no effect on water movement
DIt moves water into the lymph vessels
Answer & Solution
Correct answer: A. It draws water into the bloodstream
1. Albumin is the single largest contributor to the osmotic pressure of blood.
2. Osmotic pressure pulls water towards the compartment with the higher solute concentration.
3. Albumin is confined to the plasma, so it holds water inside the vessels and pulls water in from the tissues.
4. This is why albumin helps maintain both blood volume and blood pressure.
5. The option that has albumin driving water out into the tissues inverts the direction and is the main trap, since it is what would happen if albumin were lost from the plasma.
6. Albumin does not move water into lymph vessels, and it certainly does have an effect, so the remaining two options fail.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.1 An Overview of Blood_
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