List four factors and explain how each affects permeability. (Top. p. 1) 2) 3) 4

Question

List four factors and explain how each affects permeability. (Top. p. 1) 2) 3) 4) e. Why can some molecules (ions) cross the menbrane while othera cannot? 4. What is osmoais? (p2:A,4 a. What molecule is diffusing in oamosis? b. What is the source of energy driving osmosis? Think) c. In which direction will the net flow of 820 be moving? Tink 1. What is molarity? Know definition. Know concentration for 1 M· (p23.1 2. What is osmolarity? 2;8.2) a. Know definition of osmolarity. (p2; b. Caleulate the concentracion (g/ of following to make solution of M or Osm given: (f you need help, askt) 0.25 Osm Alcl 0.9 0am ethylene glycol 0.6 M gilycerol 0.15 0sm Baci2 0.3 0sm NaHCO3 1 M Naci 0.2 M urea 0.2 Oss urea 1 M glucose 1 0sm glucose 2 Osm thicurea 0.4 Cacl2 0.4 osm cac12 0.2 0sm thiourea c. Itat is normal osmolarity of body fluids? Immerta!LD d. What causes the body fluids to have this osmolarity? Bottom of p.2) 3. What is tonicity? (p.3: 3) a. Define and explain Isosonls b. Define and explain hvertonic c. Define and explain hpotonks d. What would happen to body cells if aurrounded by each of the above type of solutions? Be sure you can explain WEY. (p3,3) 205 Lab4 page 7

Explanation / Answer

c) 1. Charge : ions cannot easily cross the cell membrane because the membrane contains uncharged molecules that repel charged ions

2. Size: larger molecules cannot cross easily because their size is bigger than the size of the pores.

3. Concentration: lower concentration of a substance outside than inside, makes it difficult for the substance to move from outside to inside.

4. Irregularities: very large and irregular polar molecules don't fit inside the cell.

Related Questions

Navigate

• Browse (All)
• Browse L
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.