Electrolytes and Osmosis

Question 1

Osmolality

Answer 1

• Number of milimoles/kg of water
• tends to be higher than osmolarity in human blood
• Preferred measurement for humans

Question 2

Osmolarity

Answer 2

-measures number of milimoles per liter of solution

Question 3

Osmotic Pressure

Answer 3

The amount of hydrostatic pressure required to oppose the osmotic movement of water

Question 4

Tonicity

Answer 4

Interchangeable with osmolality

Question 5

Isotonic solution/Isomotic solution

Answer 5

Same osmolality as ICF or ECF

Question 6

Hypotonic Solution

Answer 6

Lower concentration of particles than ICF or ECF

-More dilute than body fluids

Question 7

Hypertonic Solution

Answer 7

Higher concentration of particles

-Denser than body fluids

Question 8

Na+/K+ pump

Answer 8

• Antiport System
• Sodium is pumped out as ATP is converted to ADP (released) and P (held by pump), Potassium is attracted to open gate and is moved inside the cell as P is released
• 1 ATP : 3 Na+ out : 2 K+ in = electrical potential (electrogenic) - inside is more negative than the outside
• Requires Na+, K+, and Mg to use ATPase as the transporter protein
• Found in almost all mammalian cells