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KINESIOL 2Y03 Lecture Notes - Lecture 8: Chemical Synapse, Extracellular Fluid, Neurotransmission

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plumcrocodile514
14 Dec 2019
School
McMaster University
Department
Kinesiology
Course
KINESIOL 2Y03
Professor
Krista Howarth

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Document Summary

M em bran e po ten tial s an d. In a resting cell: extracellular fluid is positively charged and the cytosol is negatively charged: resting neurons has an inner voltage of -70 mv. Resting potential of the membrane (6 8: resting neurons have -70 mv, only at the neurons you can have a voltage difference; far regions are neutral, concentration highlights , extracellular fluid has higher concentration of, chloride (cl-) Sodium (na+: cytosol has higher concentration of, potassium (k+, proteins (anions, calcium (ca2+) Na outside already): pumps in 2 k to the cytosol. Two types of ion channels: leak (non-gated) ion channels mostly open, gated ion channels that open and close on demand and they can change membrane potential: Establishing the resting potential (15: na, k, and proteins are involved in the resting potential, na/k pump is always open and sets up a concentration gradient (high k inside, high na outside).

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Related Questions

Cellular biology answer check. please check if my answers arecorrect or not.

1) The concentration of ions inside a cell is the same as theirconcentration outside of the cell. True or false? (i chose falsesince having equilibrium inside a cell is bad)

2) Membrane transport proteins...

a)...transport membrane potentials between cells
b) ...transport membranes from the ER to the Golgi
c) ...are made up of phospholipids
d) ...transport molecules across membranes

i chose d

3)The electrochemical gradienttakes into account:

a) The concentration of solutes on either side of themembrane.
b) The overall charge on either side of the membrane.
c) Both of these.

i chose C. (although i am sure that overall charge matters, Iwasn't sure if concentration of solutes are taken account.)

4) If no energywere expended by an animal cell:

a) Both gradients would be depleted
b)The K+ gradient would maintain itself.
c) None of these
d) The Na+ gradient would maintain itself.

I chose d) mainly because I think Na+ gradient exist in animalcell and not K+ gradient.

5) Which of the following is a true statement aboutactin?

a) Once actin has polymerized, it never depolymerizes.
b) Actin is a transmembrane protein.
c) Actin can form branched networks.
d) Actin filaments are organized into hollow tubes.

I chose c. can't explain why.

6)Ion channels:

a) Form a hydrophobic channel through the membrane
b) Have filters that let sugars through
c) Are selective for particular ions (only the