A series of straight capillaries in the medulla that lie parallel to the loop of Henle are called:

1.	arcuate arteries	2.	efferent arterioles
3.	afferent arterioles	4.	vasa recta

A triangular portion of the bladder floor bordered (ventrally) by the internal urethral opening or bladder neck and (dorsolaterally) by the orifices of the right ureter and left ureter, is called as:

1. detrusor.

2. dartos.

3. transitional epithelium.

4. trigone.

The ratio of the glomerular filtration rate to the renal plasma flow is the:
1. filtration fraction.
2. plasma clearance.
3. renal blood flow rate.
4. tubular maximum.

The glomerular ultrafiltrate will normally not contain:

About what percent of the glomerular ultrafiltrate is reabsorbed by the tubules during urine formation?

Hypoalbuminemia will result in:

1. decreased colloid osmotic pressure.

2. decreased immunity.

3. increased clotting tendency of blood.

4. decreased filtration pressure.

The proximal convoluted tubule of the nephron reabsorbs about what fraction of the filtrate?
1. 99%.
2. 85%.
3. 65%.
4. 19%.

The fluid in the nephron will have maximum osmolarity at:
1. Bowman's capsule
2. proximal tubule
3. bottom of the loop of Henle
4. distal tubule

A countercurrent mechanism system is a mechanism that expends energy to create a concentration gradient. This mechanism in human kidneys involves:
1. proximal tubule and distal tubule.
2. loop of Henle and vasa recta.
3. distal tubule and collecting duct.
4. glomerulus and Bowman's capsule.

During concentration of urine, urea diffuses out of and enters respectively into the: