Urinalysis and Body Fluids 6th Edition by Majorie DiLorenzo, Susan Strasinger

Exercise 9

Blood flows through the nephron in the following order:

A. Efferent arteriole, peritubular capillaries, vasa recta,afferent arteriole

B. Peritubular capillaries, afferent arteriole, vasa recta,efferent arteriole

C. Afferent arteriole, peritubular capillaries, vasa recta,efferent arteriole

D. Efferent arteriole, vasa recta, peritubular capillaries,afferent arteriole

Step 1 of 2

Nephron:

• Nephrons in the kidney are helpful in the formation of urine

• Each kidney contains millions of nephrons (1 to 1.5million).

Nephrons are of two types in human:

• Cortical nephron

• Juxtaglomerular or juxtamedullary nephron

Cortical nephron:

• Cortical nephrons” originate in the cortex of kidney.

• Their function is to remove waste products and to absorb nutrients from the urine.

Juxtaglomerular nephron:

• Nephron has a U shaped structure called loops of henle.

• Juxtaglomerular nephron has long loops.

• These loops extend to the medulla of kidney.

Nephron has, bowmen’s capsule, glomerulus, efferent arteriole, afferent arteriole, proximal, distal convoluted tubule, Henle’s loop, vasa recta, collecting duct.

• The urine gets filtered in nephron.

• The filtration product of plasma enters Bowman’s capsule, then afferent arteriole.

• Afferent arterioles have blood vessels that give excretory product to nephrons.

• From the afferent arterioles, the blood enters proximal convoluted tubule and distal convoluted tubule where peritubular capillaries are present.

• Then, blood passes to vasa recta where the blood moves gradually. Then it leads to efferent arteriole.

• The efferent arterioles have blood vessels which carries absorbed to the body not to the glomerules.

Therefore, the blood flows through “afferent arteriole”, “peritubular capillaries”, “vasa recta” and “efferent arteriole” in nephron. Hence, the correct answer is option.