USMLE Step 1 Renal Physiology 1 Review 58 07 Renal Blood Flow

USMLE Step 1 Renal Physiology 1 Review 58 07 Renal Blood Flow

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Play USMLE Audio MP3 58 07 Renal Blood Flow Below

Begin 58 07 Renal Blood Flow Transcription

Blood enters the kidneys via what structures?

  • Via the renal arteries.

Renal blood flow is normally what percent of cardiac output?

  • Renal blood flow is usually about 20% of cardiac output.

What is one reason for a large renal blood flow? The answer has to do with oxygen consumption.

  • One reason for a large renal blood flow is because oxygen consumption in the kidneys is very high.

What is the only organ in the body that consumes more oxygen that the kidneys do?

  • The heart.

What is the unusual relationship between blood flow and oxygen consumption in the kidneys?

  •  In the kidneys blood flow determines oxygen consumption instead of oxygen consumption determining blood flow.

What is the second reason for a large renal blood flow?

  • So that the glomerular filtration rate, the GFR, will be high.

What structure brings arterial blood to the glomerulus? It starts with AA.

  • The afferent arteriole brings arterial blood to the glomerulus.

What structure carries blood away from the glomerulus? It starts with EA.

  • Efferent arteriole.

What is the general term for the blood structures that surround the renal tubules? The answer starts with PC.

  • The peritubular capillaries surround the renal tubules.

What long straight capillary loops are formed by the branching of the efferent arteriole of a juxtamedullar nephron? The name starts with VR.

  • The vasa recta are the long straight capillary loops formed by the branching of the efferent arteriole of a juxtamedullary nephron.

Student doctor, please pause the tape and summarize what we’ve discussed about renal blood flow.

  • Blood enters the kidneys via the renal arteries. Normal renal blood flow is about 20% of cardiac output. One reason for a large renal blood flow is the high oxygen consumption of the kidneys. They rank second only to the heart in oxygen consumption. A large renal blood flow also results in a high glomerular filtration rate or GFR. The kidneys are different from all other organs because in the kidneys, blood flow determines oxygen consumption instead of oxygen consumption determining blood flow. The afferent arteriole brings arterial blood to the glomerulus and the efferent arteriole carries blood away from it. The peritubular capillaries surround the renal tubules. The vasa recta are long straight capillary loops formed by the branching of the efferent arteriole of a juxtamedullary nephron.

 

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