Renal Physiology Concepts Assessment

The video tutorial explains the glomerular filtration rate (GFR), its normal values, and factors affecting it, such as blood flow, age, and pressure. It covers the filtration fraction, osmotic and hydrostatic pressures, and the filtration coefficient. The tutorial also discusses net filtration pressure and the regulation of GFR through autoregulation and hormonal control, highlighting the roles of norepinephrine, angiotensin II, and other hormones.

What is the normal Glomerular Filtration Rate (GFR) in ml per minute?

• 100 ml/min

• 175 ml/min

• 125 ml/min

• 150 ml/min

How is the filtration fraction calculated?

• GFR times renal plasma flow

• Renal plasma flow minus GFR

• GFR divided by renal plasma flow

• Renal plasma flow divided by GFR

Which factor is directly proportional to GFR?

• Hydrostatic pressure in Bauman's capsule

• Renal blood flow

• Colloidal osmotic pressure

• Age

What happens to GFR when efferent arteriolar resistance increases?

• GFR remains unchanged

• GFR decreases

• GFR fluctuates

• GFR increases

What effect does dehydration have on colloidal osmotic pressure in the glomeruli?

• Fluctuates it

• Increases it

• Decreases it

• No effect

What is the filtration coefficient a function of?

• Renal blood flow and age

• Membrane permeability and capillary surface area

• Arterial pressure and cardiac output

• Colloidal osmotic pressure and hydrostatic pressure

What is the normal range for net filtration pressure in mm Hg?

• 20-25 mm Hg

• 15-20 mm Hg

• 10-15 mm Hg

• 5-10 mm Hg

Which hormone constricts efferent renal vessels and decreases GFR?

• Epinephrine

• Norepinephrine

• Dopamine

• Acetylcholine

What is the effect of angiotensin II on efferent vessels?

• No effect

• Constricts them

• Dilates them

• Relaxes them

Which peptide dilates efferent vessels and relaxes mesangial cells?

• Endothelin

• Atrial natriuretic peptide

• Nitric oxide

• Prostaglandins