The urethra is identified by the letter _____. (Activity 44A)

Urine formed by a kidney collects in the _____ before being drained from the kidney by the _____ and transported to the _____. (Activity 44A)

Filtrate is formed as fluid is forced through the walls of the glomerulus and, initially, collects in the structure indicated by the letter _____. (Activity 44A)

The _____ are the major blood vessels transporting blood to the kidneys. (Activity 44A)

The outer part of the kidney is the _____. (Activity 44A)

Which of these is the functional unit of a kidney? (Activity 44A)

The movement of substances out of the glomerulus and into Bowman's capsule is referred to as _____. (Activity 44B)

The movement of substances from the blood into the proximal tubule is known as _____. (Activity 44B)

Which of these is reabsorbed from filtrate? (Activity 44B)

As filtrate moves down the loop of Henle, the surrounding interstitial fluid becomes _____ concentrated than the filtrate, so _____ leaves the filtrate. (Activity 44B)

The most abundant solute in urine is _____. (Activity 44B)

Which arrow indicates the direction of a gradient of increasing solute concentration in the interstitial fluid surrounding a nephron? (Activity 44B)

Glucose is removed from filtrate by _____. (Activity 44B)

Under the influence of antidiuretic hormone (ADH), _____ is produced. (Activity 44C)

Antidiuretic hormone (ADH) makes the _____ permeable to water. (Activity 44C)