Question

question 5 of 10
what is the difference between white and red blood cells?
a. red blood cells carry oxygen; white blood cells attack viruses.
b. red blood cells are in veins; white blood cells are in arteries.
c. red blood cells hold carbon dioxide; white blood cells hold oxygen.
d. red blood cells hold oxygen; white blood cells hold carbon dioxide.

Explanation:

Red blood cells (erythrocytes) contain hemoglobin, which binds to oxygen and transports it throughout the body. White blood cells (leukocytes) are part of the immune system and help defend the body against pathogens like viruses. Option B is incorrect because both red and white blood cells are present in veins and arteries. Option C is wrong as red blood cells carry oxygen (not carbon dioxide for transport in that way - carbon dioxide transport is more complex and not the main role of red blood cells as stated here). Option D is also incorrect for similar reasons as option C regarding the functions of red and white blood cells.

Answer:

A. Red blood cells carry oxygen; white blood cells attack viruses.