What happens if afferent arteriole dilates?
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. Conversely, vasoconstriction in the afferent arteriole and vasodilation in the efferent arteriole will decrease GFR.
What causes the afferent arteriole to dilate?
A reduction in renal perfusion normally results in dilatation of the afferent glomerular arteriole and constriction of the efferent arteriole so that glomerular filtration rate (GFR) is kept constant.
How does dilation of afferent arteriole affect GFR?
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.
Which is bigger afferent or efferent arterioles?
The afferent arteriole is the arteriole that brings blood to the glomerulus. It is larger in diameter than the efferent arteriole. The efferent arteriole is the arteriole that carries blood away from the glomerulus. It is smaller in diameter than the afferent arteriole.
What is the function of the afferent arteriole?
The afferent arteriole is an arteriole that feeds blood into the glomerulus. The renal arterioles play a central role in determining glomerular hydraulic pressure, which facilitates glomerular filtration.
What type of response by the afferent arterioles would you expect if blood pressure decreased?
When blood pressure drops, the same smooth muscle cells relax to lower resistance, increasing blood flow. The vasodilation of the afferent arteriole acts to increase the declining filtrate formation, bringing NFP and GFR back up to normal levels.
What is the function of the efferent arteriole?
The efferent arterioles form a convergence of the capillaries of the glomerulus, and carry blood away from the glomerulus that has already been filtered. They play an important role in maintaining the glomerular filtration rate despite fluctuations in blood pressure.
What are afferent arterioles?
The afferent arteriole is an arteriole that feeds blood into the glomerulus. The renal arterioles play a central role in determining glomerular hydraulic pressure, which facilitates glomerular filtration. In this manner, they control the glomerular filtration.
What is the function of the afferent arteriole quizlet?
specialized structure formed by the distal convoluted tubule and the glomerular afferent arteriole. It is located near the vascular pole of the glomerulus and its main function is to regulate blood pressure and the filtration rate of the glomerulus.
What type of response does afferent arterioles have?
What type of response by the afferent arterioles would you expect if blood pressure increased? The afferent arterioles would constrict.
What happens when the afferent arterioles are dilated?
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 is the difference between afferent and efferent arteriole?
Efferent Arteriole: Efferent arterioles maintain the glomerular filtration rate. Afferent and efferent arterioles are the two types of blood vessels that supply blood the glomerulus of the kidney. The main function of the glomerulus is to filter blood plasma.
How do afferent arterioles increase blood pressure?
When the blood pressure is reduced, afferent arterioles release renin to activate the renin-angiotensin-aldosterone system, increasing the reabsorption of sodium ions from the glomerular filtrate. This may ultimately increase the blood pressure.
How does glucose dilate renal afferent arterioles?
Glucose dilates renal afferent arterioles via glucose transporter-1 Glomerular hyperfiltration occurs during the early stage of diabetes. An acute glucose infusion increases glomerular filtration rate. The involvement of tubuloglomerular feedback response and direct effect of glucose on the afferent arterioles (Af-Arts) have been suggested.