Cambridge Questions

Renal blood flow:

is sacrificed in favour of skeletal muscle in the event of volume depletion

increases following dilatation of either the afferent or efferent arteriole

accounts for a constant proportion of cardiac output irrespective of the volume status of the subject

accounts for 60% of cardiac output

varies linearly with mean arterial blood pressure

Renal blood flow accounts for around 30% of cardiac output, though this increases in the event of volume depletion as blood is preferentially diverted towards the kidneys.

By Darcy's law, renal blood flow increases in response to dilatation of any vessel along its path.

Renal blood flow is kept relatively constant over the physiological range of blood pressures: this mechanism is termed renal autoregulation and comprises tubuloglomerular feedback and myogenic mechanisms.

See A Thinking Approach to Physiology, pages 147 - 148.

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anatomy and physiology mcqs

Question #300