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MissTica
3 years ago
9

Many rickettsia are: antipathogenic pathogens smaller then viruses protozoans

Biology
1 answer:
Nat2105 [25]3 years ago
5 0
Many rickettsia are PATHOGENS.
Pathogens are micro organism that cause diseases and rickettsia are majorly disease causing organisms. They are rod shaped bacteria  and most species are gram negative. They are natural parasite of some arthropods and they cause diseases in both humans and animals.
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Explanation:

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3 years ago
the autonomic (involuntary) nervous system controls the rate at which the heartbeats. sympathetic (fight or flight) signals spee
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the autonomic (involuntary) nervous system controls the rate at which the heartbeats. sympathetic (fight or flight) signals speed up the heart’s rate while parasympathetic (rest and digest) signals slow it down. The part or parts of the heart that forms sympathetic and parasympathetic neurons form synapses is called cardiac plexus.

Cardiac plexus is a plexus of the nerves that are present at the base of the heart and is divided into superficial and deep part. The sympathetic and the parasympathetic nerves form synapses with heart in the form of cardiac plexus.

The sympathetic nerves are responsible for activating flight or fight mode while parasympathetic nerves are responsible for restoring the normal body state.

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2 years ago
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Marysya12 [62]

Answer:

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3 years ago
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Explanation:

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Answer:

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Explanation:

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3 years ago
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