PHIS 206 Lecture Notes - Lecture 4: Active Transport, Sodium-Potassium Alloy, Homeostasis

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byzantiumant990

13 Sep 2016

School

VCU

Department

Physiology and Biophysics

Course

PHIS 206

Professor

Charles Anderson; Steven Price

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Document Summary

09/02/2016: primary active transport = uphill (energy used to move things uphill from low to high, sodium-potassium pump (na-k pump, na+ out, k+ in, pumps sodium uphill, takes na+ from low to high, concentration by using atp f. In every cell in our body protein exists that moves sodium out of the cell and potassium into the cell against their concentration gradients: result: g. i. Ecf (outside of cell) high na+ and low k+ g. ii. Icf (inside of cell) low na+ and high k+ g. iii. Components of cells have important roles in maintaining homeostasis. Most movement in and out of cells is by diffusion (no energy) Plasma membrane houses proteins that control composition of inside/outside of cells. Ions require assistance to pass through membrane channels (not fatty greasy so they help to get through) Some are gated, indicating that they open and close under certain circumstances (most are gates)

Related Questions

(1) What would be thelikely outcome if an increase in both intracellular sodium ionlevels and extracellular potassium ion levels were tooccur?

A: The Na+-K+ pump would accelerate because it needs to restorethe membrane's resting concentration gradient.

B: The Na+-K+ pump would slow down because it needs to restorethe membrane's concentration gradient.

C: Sodium and Potassium ions would be pumped out of thecell.

D: Sodium and Potassium ions would increase their movement inboth directions across the cell membrane.

(2) Due to the unequal transport of sodium and potassiumions by the Na-K pump, a membrane potential isgenerated.

True or False

(3) If a pump moves 3 positive ions out and 2 positiveions in against their concentration gradients, the membranepotential in the cell will become more positive.

True or False

skyrabbit531

Which of the following scenarios likely describes a symporter? (Choose all that apply)

a) This transporter moves both Na and glucose into mammalian cells.

b) This secondary active transporter uses Na to move proline into mammalian cells.

c) This transporter allows K ions to flow down their concentration gradient when the voltage of the membrane changes.

d) This transporter utilizes energy from ATP hydrolysis to move Ca2 into the endoplasmic reticulum.

e) This transporter is responsible for maintaining high [Na ] outside the cell and high [K ] inside the cell.

taupegnu198

Read the following scenarios and indicate which of the following processes they describe.

11. Sodium molecules move randomly around a solution of sodium chloride in water, frequently colliding with other sodium ions and chloride ions. secondary active transport diffusion osmosis facilitated diffusion primary active transport

12. Sodium ions (Na+) move through sodium channels in a synthetic membrane. primary active transport secondary active transport facilitated diffusion osmosis

13. Water molecules move into the cytosol of a cell placed in a hypotonic solution. primary active transport secondary active transport facilitated diffusion osmosis

14. Water molecules move into the cytosol of a cell placed in pure water. facilitated diffusion osmosis secondary active transport primary active transport

15. Water molecules move out of a cell placed in a hypertonic solution. facilitated diffusion primary active transport secondary active transport osmosis

16. The action of sodium-potassium pumps moves sodium ions (Na+) out of a cell and potassium ions (K+) into a cell. facilitated diffusion secondary active transport osmosis primary active transport

17. Glucose molecules move into cells lining the intestine against their concentration gradient driven by the movement of sodium ions (Na+) into the cells down their concentration gradient. osmosis secondary active transport primary active transport facilitated diffusion

18. A beaker of water is separated by a selectively permeable membrane that allows the passage of water but not ions. A solution of 4% sodium chloride (NaCl) is placed on one side of the membrane and pure water is placed on the other side of the membrane. The solutions are allowed to equilibrate. At this point, which process is going on? facilitated diffusion osmosis secondary active transport primary active transport

amaranthelk944

PHIS 206 Lecture Notes - Lecture 4: Active Transport, Sodium-Potassium Alloy, Homeostasis

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