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andreyandreev [35.5K]
3 years ago
9

The sa node acts as the pacemaker of the heart because these cells are __________.

Biology
1 answer:
jekas [21]3 years ago
5 0
The heartbeat has two specialised areas of muscle (the sa node and the av node) that control and synchronise the heartbeat. The rhythm of relaxation and concentration of the pacemaker sets the rythym of the heartbeat.
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What effects does time have on bacterial cells?
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Explanation:

With time bacteria cells increase in number, exponentially. This means with each generation, the population doubles. An example is that if initially there were 2 bacteria, they become 4, then 16, then 32, then 64, 128, then 256...etcetera.  Remember bacteria can double their population in very short times. E. Coli cells double in the lab in 15 – 20 minutes.

However, bacteria are also subject to limiting factors that do not allow their cells to double indefinitely, resources such as space and nutrients limiting growth rates for bacteria especially when their numbers exceed the carrying capacity of their environment.

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You identify a new species of microorganism in an undersea thermal vent. The microbe is a single cell organism that lacks a nucl
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The domain of the new species of unicellular microorganism in an undersea thermal vent that lacks a nucleus is Archeae.

<h3>What is domain?</h3>

Domain in biology refers to the highest rank in the classification of organisms, above kingdom.

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Therefore, the domain of the new species of unicellular microorganism in an undersea thermal vent that lacks a nucleus is Archeae.

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