It takes patience and favourable imaging conditions (like thin abdominal wall and patient cooperation) to locate the renal arteries and veins by color doppler and even more difficult to get a spectral waveform tracing of the vessels.
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal or sexual attraction, although erections can also be spontaneous.
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