Question

1. blood does all of the following, except

a. produce stem cells
b. destroy invading pathogens
c. transport oxygen and carbon dioxide
d. transport endocrine hormones

Explanation:

• Option b: Blood contains white blood cells that can destroy invading pathogens, so this is a function of blood.
• Option c: Red blood cells in blood transport oxygen from lungs to tissues and carbon dioxide from tissues to lungs, so this is a function of blood.
• Option d: Blood acts as a transport medium for endocrine hormones to reach their target organs, so this is a function of blood.
• Option a: Stem cells are produced in the bone marrow, not by the blood itself. Blood carries cells (including stem - derived cells) but does not produce stem cells.

Answer:

a. Produce stem cells