Why is it correct to call red blood cells living cells?
Because they fulfill all other characteristics of life except reproduction
I'm not sure if my response will be appropriate for a sieve plate, but I'll base it on what I know about erythrocytes, or red blood cells.
These days, life's qualities are:
Cellular Organization: Cellular organization is irrelevant since we are only thinking about one cell.
Reproduction: Red blood cell precursors are first generated in the bone marrow with a nucleus that is capable of reproduction; however, after they reach maturity, this nucleus is removed for functional reasons (to free up space and reduce energy consumption). It's important to note that many fully differentiated cells—such as neurons or mammalian RBCs—are incapable of replicating.
Metabolism: To sustain its metabolic processes, RBCs generate energy through anaerobic glycolysis.
Homeostasis: RBCs keep internal environment conditions almost constant.
Heredity: Hematopoietic stem cells, the precursors of RBCs, have a nucleus and are able to produce new RBCs, but mature RBCs lack a nucleus and are therefore unable to reproduce.
Red blood cells (RBCs) react to stimuli.
Growth and Development: RBCs develop into fully mature erythrocytes from hematopoietic stem cells.
Evolutionary adaptation: the nucleus was actually removed from red blood cells during the evolution of these cells, a feature unique to mammals (rBCs nucleated in birds or amphibians, for example).
RBCs can actually be referred to as living cells despite lacking nucleas because they exhibit most of the characteristics of life and can persist in existence despite not being able to reproduce in the traditional sense (when they reach a mature state).
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Because they can metabolize, react to stimuli, and reproduce (though through a process called erythropoiesis), red blood cells are classified as living cells. They also contain genetic material in the form of RNA, which allows them to synthesize proteins that are essential for their functions.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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