AP BIOLOGY

Detailed explanation-1: -This nature of the red blood cell membrane is known as semi permeable, which is option B. So this is the right answer.

Detailed explanation-2: -The Erythrocyte Membrane. Composed of a lipid bilayer and an underlying cortical membrane skeleton (Fig. 152-1), the membrane provides the erythrocyte the deformability and stability required to withstand its travels through the circulation.

Detailed explanation-3: -Far from being just a casing, however, the red cell membrane plays a critical role in maintaining cellular functions in the only non-nucleated cell in the body (the cellular organelles are lost during red cell maturation). Thus, the red cell membrane accomplishes vital tasks in the transport of salts and nutrients.

Detailed explanation-4: -Hemoglobin, or Hb, is a protein molecule found in red blood cells (erythrocytes) made of four subunits: two alpha subunits and two beta subunits (Figure 20.19). Each subunit surrounds a central heme group that contains iron and binds one oxygen molecule, allowing each hemoglobin molecule to bind four oxygen molecules.

Detailed explanation-5: -Red blood cells, also known as erythrocytes, deliver oxygen to the tissues in your body. Oxygen turns into energy and your tissues release carbon dioxide. Your red blood cells also transport carbon dioxide to your lungs for you to exhale.