Marey's Law

[asutoshsahu]

I know that Marey's law states that there is a inverse relationship between Rate of heartbeat and blood pressure.

But I wanna know what is the mechanism of this law.

Please help me.

[TheIntelligentDesigner]

Well it's simple, your heart doesn't need more pressure as its rate increases. For example, when someone is losing a lot of blood and is going into shock, breathing increases and the heart beats faster. As the heart beats faster, the blood pressure goes down. And while rigorous activity like running, blood vessels dilate so I don't believe that more pressure is needed, but just a more constant supply of oxygenated is, as provided by the increased heart rate. But that's just my hypothesis.

[mith]

As the heart beats faster, the blood pressure goes down. And while rigorous activity like running, blood vessels dilate so I don't believe that more pressure is needed, but just a more constant supply of oxygenated is, as provided by the increased heart rate. But that's just my hypothesis.

I think it beats faster because the pressure is low, it's an effect not a cause.

[Poison]

The amount of O2 carried with low pressure is not enough for your tissues, so heart beats faster to pump more blood to tissues.

[ahm_k1]

this is related to pressor and deressor responses of CSC in the medulla but i ll explain it upnext

[Jammerz]

Well it's simple, your heart doesn't need more pressure as its rate increases. For example, when someone is losing a lot of blood and is going into shock, breathing increases and the heart beats faster. As the heart beats faster, the blood pressure goes down.

This isn't exactly related to the original question, but just want to make a note on this here...

In early stages of shock, blood pressure is maintained at a relatively constant level (compensated shock), even though heart rate and respirations increase (to increase perfusion of oxygen and blood flow), because blood is shunted to the vital/core organs (in other words, distal/peripheral blood vessels constrict, which prevents blood pressure from falling further).

In decompensated (late) shock, blood pressure begins to fall due to a loss of blood and overall decreased volume.

[guyface]

- The influence of arterial blood pressure on heart rate is dependent upon the baroreceptors, which are found in the aortic arch and the carotid sinus
- Changes in HR from baroreceptor activation is due to reciprocal changes in both the sympathetic and parasympathetic nervous systems
- These changes occur with little or great changes in pressure
- With small changes in pressure, there are minor autonomic changes
- Great changes in pressure can totally shut down the sympathetic nervous system, and the opposite is true in cases of severe hypotension