During growth of an individual animal some components of the body grow in size but not in number (type 1) while some others increase in number but not in size (type 2). Which of the following is correct?
A. type 1: bones and muscle cells; type 2: hair follicles, red blood cells and epithelial cells.
B. type 1: bones and red blood cells; type 2: hair follicles, muscle cells and epithelial cells.
C. type 1: hair follicles and muscle cells; type 2: bones, red blood cells and epithelial cells.
D. type 1: epithelial cells and bones; type 2: hair follicles, red blood cells and muscle cells. 11.
Answers
Answer:
I know muscle cells only grow in size. I am unsure about hair follicles, which is why I am confused between options A and C. I am also confused about bone growth. Does it ever increase in number? It would be nice if someone could clear that up.
Osteocytes
We know from this page that "osteocytes have an average half life of 25 years, they do not divide" and that "when osteoblasts become trapped in the matrix that they secrete, they become osteocytes. Osteocytes are networked to each other via long cytoplasmic extensions that occupy tiny canals called canaliculi".
We can thus conclude that bone cells don't grow in numbers, but in size by their cytoplasmic extensions.
Hair follicles
Well, we draw the conclusion that hair follicles grow in number and not in size based on the following common sense observations:
We don't get to see tiny hair follicles in babies and giant ones in adults;
If they don't grow in size, either they grow in number or they become less and less dense as the skin surface grows with age. If the latter, we should see the same hair number in babies and in adults, whichever their height is, and this is obviously not the case.
Answer is A
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Answer:
I can't understand the question so kindly briefly