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15 Cards in this Set
- Front
- Back
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What nervous system innervates the heart?
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autonomic nervous system
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The innervation of the heart consists of what components of the nervous system?
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parasympathetic and sympathetic
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What is the coronary plexus?
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The innervation of both sympathetic and parasympathetic components of the heart.
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The autonomic centers in the brainstem affect the heartbeat how?
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By slowing it down or speeding it up, they DO NOT initiate a heart beat
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What innervations is carried out by nerve fibers from the T1-T5 segments of the spinal cord?
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Sympathetic innervation
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T1-T5 nerve fibers carries out what type of innervation to the heart?
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sympathetic
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How will T1-T5 nerve fibers affect the heart rate?
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Speed it up!
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Where does parasympathetic innervation come from?
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medulla oblongata via the left and right vagus nerves!!!!
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How does the medulla oblonga affect the heart?
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through parasympathetic innervation, it slows down the heart rate...generally has no effect on the force of contractions!
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What nerves slow down the heart?
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Vagus nerves
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What nerve slows down the heart rate?
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CN X
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parasympathetic innervation does what to the heart rate?
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Slows it down
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What is vasovagal syncope?
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Hyperventilation reduces CO2 levels which causes vasoconsriction of cerbral blood vessels (less blood flow to the brain)
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How does pressure on the chest reduce cardiac output
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impairs bood flow by putting pressure on major blood vessels (less blood flow to the brain) it stimulates the vagus nerve, which suppresses heart rate.
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how does vasovagal syncope occur?
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hyperventilation reduces CO2 levels, causes vasoconstriciton of cerebral bv's, pressure applied to chest reduces cardiac output and impairs blood flow by putting pressure on major bv's the pressure also stimulates vagus nerve, which suppresses heart rate..
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