The figure shows a path model of the homeostatic system that...

Name: the figure shows a path model of the homeostatic system that regulates the osmolarity of blood this regulated variable is represented by a dashed box other variables are represented by solid 49573
Uploaded: 2023-06-09T19:26:06-08:00
Duration: 5 min 27 s
Channel: Sri K
Description: the figure shows a path model of the homeostatic system that regulates the osmolarity of blood this regulated variable is represented by a dashed box other variables are represented by solid 49573

The figure shows a path model of the homeostatic system that regulates the osmolarity of blood. This regulated variable is represented by a dashed box. Other variables are represented by solid black boxes. An arrow connecting one box to another indicates a relationship between two variables. The sign above an arrow (+ or -) indicates whether the variables are related positively or negatively. Activity of channel proteins in nerve cells membranes Osmolarity of blood Activity of nerve cells in "thirst center" of hypothalamus Volume of water ingested by a person Which variable depends directly on the activity of nerve cells in the "thirst center" of the hypothalamus? the activity of channel proteins the osmolarity of blood the volume of water ingested

Transcript

00:01 Hello in this question i can say that the stimulus is drop in plasma volume talking about the controller so the controller is the hypothalamus which responds to stimulus by increasing by increasing the production of by increasing the production of vesopressin or antidiuretic hormone that is adh coming to the plant the plant is the kidneys distal convoluted tubule and collecting duct these are these are responsible for absorbing for absorbing water and sodium coming to the feedback element feedback feedback element it is basically the adh concentration in plasma adh concentration in plasma coming to the controlling variable coming to the controlling variable it is the production of adh by hypothalamus and finally the controlled variable the controlled variable is basically the water permeability the water permeability of the of the kidneys kidneys dct that are distal convoluted tubule and the collecting ducts and the collecting ducts now let us talk about the negative feedback the negative feedback achieved by the system so firstly when there is in decreased in plasma volume it stimulates it stimulates left arterial left arterial pressure receptors pressure receptors which sends signal to signal to hypothalamus which sends signal to hypothalamus the hypothalamus it responds by increasing the level of adh this increased adh can this increased adh concentration this increased adh concentration in blood plasma in blood plasma it leads to increased water permeability increased water permeability of kidneys distal tubules distal tubules and collecting duct and collecting duct as a result water is reabsorbed which helps to restore the plasma volume and stabilize water balance and finally the increased plasma volume the increased plasma volume it reduces the stimulus it reduces the stimulus for adh production adh production creating a creating a negative negative feedback loop creating a negative feedback loop that regulates that regulates water balance water balance and sodium excretion that regulate water balance and sodium excretion...

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