Elasmobranchs

Question 1

Elasmobranchs are ____ _____

Answer 1

• osmoconforming ionregulators (NaCl)

Question 2

What does it mean that elasmobranchs are slightly hyperosmotic?

Answer 2

• osmotic uptake of water with no water loss

Question 3

Elasmobranchs are hyperosmotic but ____ to seawater

Answer 3

• hypoionic (low)

Question 4

What is an elasmobranch’s osmolyte?

Answer 4

• urea and NaCl

Question 5

What are the 4 main processes of urea reabsorption?

Answer 5

• Na:urea cotransport
• Phoretin blocks urea reuptake
• COUNTER CURRENT BUNDLE

Question 6

The kidney cannot concentrate ____

Answer 6

• NaCl

Question 7

The kidney and gill are not for ____ ____.

Answer 7

NaCl secretion