BIOD27H3 Chapter Notes -Extracellular Fluid, Reference Electrode

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cerisellama664

17 Dec 2010

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: 4 k in and 4 na out= neutral. Membrane potential (-70mv) or membrane potential: a voltmeter is used to measure the electrical difference (membrane potential versus time) between the inside of the cell and the outside of the cell in volts or microvolt. The reference electrode is placed in the extracellular fluid (in the diagram, it is in a saline bath). This makes it possible for k to leave since the membrane is impermeable to ions. Since there is no k in the extracellular fluid, it is so easy for it to go outside of the cell (concentration gradient). Since the k and proteins are attracted to each other, due to charge, the proteins want to leave the cell as well. Because opposite charges attract each other, the negative proteins are going to attract the k ions back into the cell, its calling in. its e-ion will be -90mv.

Related Questions

During active transport in the neuron, the outside of the cell is _________________ and the inside is _______________.

positive, negative

more positive, less positive

more negative, less negative

negative, positive

In active transport, _____________ provides the energy to move molecules against their concentration gradient.

nucleus

potassium

sodium

adenosine triphosphate

________________ proteins can change shape when moving substances across the membrane.

Proteins that can be open or closed, based on different conditions, are called ___________.

bypass proteins

channel proteins

selective proteins

gated

Tunnels that allow charged ions to move easily across the plasma membrane without the use of energy are called ____________________.

channel proteins

glycolypipd proteins

phospholipid proteins

carbohydrate chains

____________ and ____________ make it easier for molecules to move across the plasma membrane.

small, negatively charged

small, positively charged

small, no charge

large, negatively charged

large, positively charged

For a cell with 120 mM K+, protein- inside, and 4 mM K+ outside, with proteins-impermeable and K+ permeable to the membrane, which of the following statements istrue at equilibrium?a. The chemical potential driving K+ inward is equal in magnitude to the electricalpotential driving potassium outward.

b. Bulk movement of K+ out of the cell occurs due to the impermeable proteins-.

c. The net flux of potassium equals zero.

d. There will be 62 mM K+ protein inside and 62 mM K+ protein outside the cell.

e. The inside of this cell will be electrically positive with respect to the outside.

pearmammoth754

Which of the following statements about resting membrane potential is not true? Why?

(a) The resting membrane potential for most animal cells is 0 mV, because the positive and negative ions are in balance.

(b) The resting membrane potential for most animal cells is positive, because Na+ ions are so plentiful inside cells.

(c) The resting membrane potential for most animal cells is negative, because the inside of the cell is more negatively charged than the outside of the cell.

(d) At the resting membrane potential, no ions enter or exit the cell.

lemonllama817

BIOD27H3 Chapter Notes -Extracellular Fluid, Reference Electrode

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