Question

1. which of the following are true? i. mature red blood cells do not contain a nucleus. ii. red blood cells contain hemoglobin, which binds to oxygen. iii. red blood cells transport oxygen to body cells and transport some carbon dioxide from body cells. iv. hemocytoblasts give rise to all types of blood cells. a. i, ii, and iii b. ii and iii only c. ii, iii, and iv d. i, ii, iii, and iv

Explanation:

• I: Mature red - blood cells lose their nucleus during development to make more space for hemoglobin.
• II: Hemoglobin in red - blood cells binds to oxygen in the lungs for transport.
• III: Red - blood cells carry oxygen to body cells and some carbon dioxide back from body cells.
• IV: Hemocytoblasts are hematopoietic stem cells that give rise to all types of blood cells.

Answer:

d. I, II, III, and IV