Which of the following statements about red blood cells is true?
A) The main function of red blood cells is to carry nutrients.
B) Red blood cells are shaped like biconcave disks.
C) Each red blood cell contains about 1 million molecules of hemoglobin.
D) Red blood cells in adult humans have nuclei.

Question

Quizplus · Accepted Answer

Red blood cells are indeed shaped like biconcave disks, which helps to increase surface area for oxygen and carbon dioxide exchange.

Answer: C 
 Each red blood cell does contain approximately 1 million molecules of hemoglobin, which is the protein that binds to oxygen and helps transport it throughout the body.

Therefore, the correct choices are B and C.

Which of the Following Statements About Red Blood Cells Is