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BIO 202 Ch. 18 Part 2: Erythrocytes Exam Questions and Answers 2024/2025( A+ GRADED 100% VERIFIED). CA$17.26   Add to cart
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BIO 202 Ch. 18 Part 2: Erythrocytes Exam Questions and Answers 2024/2025( A+ GRADED 100% VERIFIED).
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BIO 202 Ch. 18 Part 2: Erythrocytes Exam Questions and Answers 2024/2025( A+ GRADED 100% VERIFIED).

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  • September 12, 2024
  • 11
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • bio 202 ch 18 part 2 erythrocytes
  • erythrocytes ans red blood cells
  • 1 to pick up oxygen from the lungs and deliver it
  • rbcs ans the most abundant formed element of bl
  • rbcs severe deficiency can b

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  • BIO 202 Ch. 18 Part 2: Erythrocytes
  • BIO 202 Ch. 18 Part 2: Erythrocytes

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BIO 202 Ch. 18 Part 2: Erythrocytes
Erythrocytes - ANS red blood cells

1. to pick up oxygen from the lungs and deliver it to tissues elsewhere
2. to pick up carbon dioxide from the tissues and unload it in the lungs - ANS 2
principal functions of erythrocytes

RBCs - ANS the most abundant formed element of blood

RBCs- severe deficiency can be fatal within minutes bc carry oxygen

deficiency of leukocytes/ platelets fatal within a few days - ANS which formed
element is most critical to survival

biconcave shape- thick rim and thin sunken center
about 7.5 µm diameter and 2.0 µm thick at rim - ANS what do erythrocytes look
like?

RBCs lose nucleus and other organelles during maturation- devoid of internal
structure - ANS what organelles are contained in RBCs?

RBCs have no mitochondria -> rely on anaerobic fermentation

no aerobic respiration means RBCs do not consume the oxygen they transport to
other tissues (deliver O2, don't consume it) - ANS how do RBCs produce ATP?

why is this significant

RBCs (deliver O2, don't consume it) - ANS what are the only human cells that
carry on anaerobic fermentation indefinitely?

hemoglobin - ANS red pigment that gives an RBC its color and name
known especially for its role in oxygen transport, but it also aids in the transport
of carbon dioxide and the buffering of blood pH

33% of cytoplasm of an RBC

, carbonic anhydrase (CAH) - ANS enzyme in the cytoplasm of an RBC that
catalyzes the reaction:
CO2 + H2O <-> H2CO3

plays a role in gas transport and pH balance

glycolipids on the outer surface - ANS what component of the plasma membrane
of an RBC determines a person's blood type?

spectrin and actin - ANS 2 cytoskeletal proteins on the inner surface of the RBC
plasma membrane that gives the membrane resilience and durability

when RBCs pass through small blood capillaries and sinusoids, many of these
passages are narrower than the diameter of an RBC, forcing RBCs to stretch,
bend, and fold as they squeeze through

when they enter larger vessels, RBCs spring back to their discoidal shape like an
air filled tube - ANS why are spectrin and actin important?

- maximizes ratio of cell surface area to volume -> quick diffusion of oxygen to all
hemoglobin in the cell
-- however, RBCs only load oxygen in capillaries and RBCs are compressed into
ovoid/ teardrop shapes when squeezing through capillaries; spring back to
biconcave when reentering larger blood vessels, but do not pick up O2

- biconcave shape minimizes RBC spin and turbulence, enabling dense slurry of
RBCs to flow through the larger blood vessels with a smooth laminar flow

- easiest, most stable shape for the cell and its cytoskeleton to relax into when
the nucleus is removed, and it may have no physiological function at all - ANS 2
possible functional advantages of the biconcave shape of the RBC

globins - ANS hemoglobin consists of these 4 protein chains (2 alpha, 2 beta)

alpha: 141 amino acids long
beta: 146 amino acids long - ANS how long are alpha globin chains?
How long are beta globin chains?

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