Question

4 points
2. Potential difference across
resting membrane is negative.
This is due todifferential
distribution of the following
ions
a. Na+ and K+
b. CO3 ++ and CI
O c. Ca++ and Mg++
O d. Ca++ and I​

Answer 1

Answer:A neuron is said to be polarized because

a. the action potential can travel in one direction only.

b. the soma is always at one extremity of the cell.

*c. there is a difference of electrical potential across its membrane.

d. it tends to cluster with other neurons in nuclei.

75. Axons generally have which of the following concentrations of ions

INTERNALLY (relative to extra-cellular space)?

a. High K+, high Na+, low Cl-.

*b. High K+, low Na+, low Cl-.

c. Low K+, high Na+, low Cl-.

d. Low K+, low Na+, low Cl-.

76. The extracellular space around axons generally has which of the following

concentrations of ions (relative to intracellular concentrations)?

*a. Low K+, high Na+, high Cl-.

b. Low K+, high Na+, low Cl-.

c. High K+, low Na+, low Cl-.

d. High K+, low Na+, high Cl-.

77. The membrane of a typical resting neuron is largely impermeable to

*a. Na+.

b. K+.

c. Cl-.

d. none of the above.

Explanation: