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Red Blood Cells (Erythrocytes) Function

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Questions and Answers

What is the major function of red blood cells?

Circulating free hemoglobin in plasma

Expelling carbon dioxide into the atmosphere

Producing carbonic anhydrase for acid-base balance

Transporting hemoglobin to carry oxygen (correct)

What happens when hemoglobin is free in the plasma of human beings?

It converts carbon dioxide to water in the bloodstream

It forms carbonic acid in the lungs

About 3% of it leaks through capillary membranes into tissue spaces or glomerular filtrate (correct)

It increases the rate of oxygen delivery to tissues

Besides transporting hemoglobin, what other function do red blood cells perform?

Expel excess bicarbonate ions into the atmosphere

Contain a large quantity of carbonic anhydrase for CO2 transport (correct)

Act as a storage site for excess oxygen

Circulate free proteins in the plasma

What makes it possible for the blood to transport enormous quantities of CO2 from the tissues to the lungs?

Rapid reversible reaction catalyzed by carbonic anhydrase Signup and view all the answers

What is responsible for most of the acid-base buffering power of whole blood?

Hemoglobin in red blood cells Signup and view all the answers

What is the enzyme present in red blood cells that catalyzes the reversible reaction between carbon dioxide and water?

Carbonic anhydrase Signup and view all the answers

In which form is carbon dioxide transported from the tissues to the lungs in the blood?

As bicarbonate ion Signup and view all the answers

What happens to hemoglobin when it is free in the plasma of human beings?

It leaks through capillary membranes into tissue spaces Signup and view all the answers

What percentage of hemoglobin leaks through the capillary membrane into tissue spaces when it is free in the plasma of human beings?

3% Signup and view all the answers

In which animals does hemoglobin circulate as free protein in the plasma, not enclosed in red blood cells?

Lower animals Signup and view all the answers