How does the diameter of the afferent arteriole affect glomerular capillary pressure?

How does the diameter of the afferent arteriole affect glomerular capillary pressure?

An increase in the afferent arteriolar diameter (decrease in resistance) causes an increase in the glomerular capillary hydrostatic pressure and an increase in GFR. A decrease in the diameter of the afferent arteriole has the opposite effect.

What increases glomerular capillary pressure?

The increase in glomerular capillary pressure is accompanied by increased glomerular blood flow, which is caused by afferent arteriolar dilation but with little or no dilation of the efferent arteriole.

What happens to glomerular capillary pressure when the afferent arteriole radius is increased?

When afferent radius decreased the pressure and filtration rate decreased. When afferent radius increase, the pressure and filtration rate increased.

How does the afferent arteriole radius affect the rate of glomerular filtration?

1. If all other variables are kept constant, how does the afferent arteriole radius affect the rate of glomerular filtration (select all that apply)? You correctly answered: c. An increased afferent arteriole radius will increase the rate of glomerular filtration.

How would afferent arteriole dilation in response to a fall in blood pressure affect the GFR?

Falling blood pressure does the opposite: dilate the afferent arteriole and preserve blood flow to the kidney. Secondly, the renin-angiotensin-aldosterone system acts to preserve GFR. The juxtaglomerular cells in the afferent arteriole release renin in response to decreased stretch.

When the afferent arterioles of glomerular capillaries constrict?

Constriction of the afferent arterioles has two effects: it increases the vascular resistance which reduces renal blood flow (RBF), and it decreases the pressure downstream from the constriction, which reduces the GFR.

How does the afferent arteriole create high blood pressure in the glomerulus?

It is because the afferent arteriole, which delivers blood to the glomerulus, has little vascular resistance because it is short and wide. So the pressure decrease is smaller compared to other tissues. And the pressure in capillaries of glomeruli is so high because it is specialized for filtration.

Why does increasing the radius of the afferent arteriole increase the glomerular filtration rate?

Increasing the afferent radius had a greater effect than decreasing the efferent radius because there was a greater increase in glomerular pressure. in the body, how does a nephron maintain a near-constant glomerular filtration rate despite a constantly fluctuating blood pressure?

What effect will vasodilation of the afferent arteriole have on glomerular hydrostatic pressure and glomerular filtration rate?

Pressure changes within the afferent and efferent arterioles that go into and out of the glomerulus itself will also impact GFR. Vasodilation in the afferent arteriole and vasconstriction in the efferent arteriole will increase blood flow (and hydrostatic pressure) in the glomerulus and will increase GFR.

How does the radius of the efferent arterioles affect the glomerular capillary pressure and the GFR?

If all other variables are kept constant, how does the efferent arteriole radius affect the rate of glomerular filtration (select all that apply)? You correctly answered: a. An increased efferent arteriole radius will decrease the rate of glomerular filtration.

What effect will vasoconstriction of the afferent arteriole have on blood pressure?

This vasoconstriction predominantly affects the afferent arteriole, effectively reducing hydrostatic pressure within the glomerular capillary lumen and decreasing glomerular filtration. The resulting reduction in the glomerular filtration rate (GFR) reduces the filtered load of Na+ to the nephrons.

How does dilation of afferent arterioles decrease blood pressure?

Dilation of the afferent arterioles has the opposite effects. Constriction of the efferent arterioles also increases the vascular resistance so it reduces RBF. The pressure within the glomerular capillaries may increase, however, because the flow is slowed by efferent arteriolar constriction.

What happens when the afferent arteriole is dilated?

As the afferent arteriole dilates it exposes the glomerulus to an increased blood pressure, closer and closer to that of the full systemic blood pressure. This increases GFR and Glomerular pressure.

Why does dilation of the arteriole increase glomerular filtration rate?

The answer to this is option C. Dilation of the afferent arteriole will increase the renal plasma flow and glomerular filtration rate. The reasons for this are the following: the renal vascular resistance is lessened while the hydrostatic pressure is heightened.

How does afferent Arteriolar constriction affect renal blood flow?

Effect of afferent arteriolar and efferent arteriolar constriction and dilation on renal blood flow (RBF), glomerular filtration rate (GFR), and filtration fraction (FF). Constricting the afferent arteriole reduces RBF because the vascular resistance is increased.

How is the glomerular capillary hydrostatic pressure affected?

The glomerular capillary hydrostatic pressure is affected by the afferent and efferent arteriolar resistance and the renal artery pressure ( 3 ). An increase in the afferent arteriolar diameter (decrease in resistance) causes an increase in the glomerular capillary hydrostatic pressure and an increase in GFR.