(Solved): 25. What are the two types of photoreceptors, and how do their functions differ? CHAPTER 19. THE CA ...

25. What are the two types of photoreceptors, and how do their functions differ? CHAPTER 19. THE CARDIOVASCULAR SYSTEM: THE BLOOD 26. True or false: Hemoglobin functions in transporting both oxygen and carbon dioxide. 27. Which statements explain why red blood cells (RBCs/erythrocytes) are highly specialized for oxygen transport? (Select all that apply.) (a) RBCs contain hemoglobin. (b) RBCs lack a nucleus. (c) RBCs have many mitochondria and thus generate ATP aerobically. (d) The biconcave shape of RBCs provides a large surface area for the inward and outward diffusion of gas molecules. 28. Which formed elements of the blood are cell fragments? 29. Which white blood cells (WBCs/leukocytes) are called granular leukocytes? Why? 30. Which white blood cells (WBCs/leukocytes) are called agranular leukocytes? Why?