Because there will eventual reach a point where the food or some other necessity runs out and instead of growth continuing, it stays at relatively constant.
Nucleus. Cytoplasm . Ribosome . Endoplasmic reticulum . Golgi body . Mitochondria . Lysosome
Cell membrane
the following parts of a cell.
Structure
Your heart rate before exercising would probably be the at rest rate of say about 50-60 beats per minute whereas immediately after exercise it could easily be say 115-130 and depending on age there is an optimum heart rate for each age range which decreases somewhat with age. Timing for a full minute your heart rate is best as it will give the actual count whereas if you just do it for 10 seconds and then multply by 6 it would assume it will be consistent whereas it could decrease during the minute so the actual measured count for a full minute is more accurate.
<span>Defines cell shape= </span><span>cytoskeleton
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