Why are cell organelles absent in RBC?

Explanation: absence of nucleus provides the RBC’s its biconcave structure thus increasing their surface area to absorb more oxygen. The absence of mitochondria means the RBC won’t be able to utilize the oxygen for it thus increases transportation efficiency.

Do red blood cells have smooth endoplasmic reticulum?

Red blood cells are considered cells, but they lack a nucleus, DNA, and organelles like the endoplasmic reticulum or mitochondria.

What does the endoplasmic reticulum do in a red blood cell?

The ER has a central role in lipid and protein biosynthesis. Its membrane is the site of production of all the transmembrane proteins and lipids for most of the cell’s organelles, including the ER itself, the Golgi apparatus, lysosomes, endosomes, secretory vesicles, and the plasma membrane.

How do RBC survive without organelles?

RBCs are there to supply oxygen in the body and they do so via the help of hemoglobin. So, they are designed to have maximum area to incorporate hemoglobin to supply maximum hemoglobin that they can incorporate and thus they have no cell organelle like nucleus or mitochondria.

In which animal RBC is absent?

Human blood is composed of three cell types namely RBC, WBC and platelets. In humans the RBC is enucleated whereas RBC of birds and many animals are nucleated. Both RBC’s and haemoglobin are absent in crocodiles.

Why is the endoplasmic reticulum important?

The endoplasmic reticulum (ER) serves important functions particularly in the synthesis, folding, modification, and transport of proteins. SER is involved in the synthesis of lipids, including cholesterol and phospholipids, which are used in the production of new cellular membrane.

Which one is not the function of endoplasmic reticulum?

The rough endoplasmic reticulum is especially prominent in cells such as hepatocytes. The smooth endoplasmic reticulum lacks ribosomes and functions in lipid synthesis but not metabolism, the production of steroid hormones, and detoxification.

Why do RBC survive without nucleus?

– Unlike the rest of the cells in your body, your red blood cells lack nuclei. Losing the nucleus enables the red blood cell to contain more oxygen-carrying hemoglobin, thus enabling more oxygen to be transported in the blood and boosting our metabolism.

How do RBC survive without mitochondria?

Because RBCs do not contain any mitochondria, they can not utilise oxygen they transport and produce ATP through glycolysis followed by lactic acid fermentation. …

Does frog have RBC?

Frogs have red blood cells and white blood cells in their blood. The red blood cells of frogs are shown in Figure 4. The red blood cells of frogs are larger than human red blood cells. They are also somewhat elliptical rather than round like human red blood cells.

Why is blood of cockroach called hemolymph?

The blood of cockroaches is colorless and is referred to as hemolymph. The hemolymph contains no hemoglobin and instead it is composed of a fluid plasma in which blood cells are suspended. The blood cells are also known as hemocytes or corpuscles. This is the reason why the blood of cockroaches is called hemolymph.