Lecture 2

Question 1

What comprises the Urinary Secretion equation?

Answer 1

Urinary Excretion =

Glomerular Filtration - Tubular reabsorption + Tubular secretion

Question 2

Define Osmolarity.

Answer 2

Osmolarity = Number of osmotically active particles / L of solution

Question 3

If ingested excess water, how does the body cahnge urine osmolarity?

Answer 3

The body has the ability to excrete urine with a low osmolarity, such as a Urine osmolarity = 50 mosm/L

Question 4

How do the kidneys regulate excretion of solutes independently of one another?

Answer 4

By controlling their reabsorption of different substances, the kidneys regulate excretion of solutes independently of one another, a capability that is essential for precise control of the body fluid composition.

Question 5

What are TWO factors that need to occur for a substance to be reabsrobed?

Answer 5

For a substance to be reabsorbed, it must first be transported:

(1) Across the tubular epithelial membranes into the renal interstitial fluid
(2) Then moved through the peritubular capillary membrane and back into the blood

Question 6

What is the normal Plasma K⁺ level?

Answer 6

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