Exam 2: Cell Physiology

Assume a hypothetical postsynaptic neuron has three presynaptic inputs, X, Y, and Z.When presynaptic neurons X and Y are stimulated simultaneously, the postsynaptic neuron reaches threshold and undergoes an action potential.Yet, when presynaptic neurons X and Z are stimulated simultaneously, there is no change in potential of the postsynaptic neuron.Which of these statements describes the presynaptic neurons Y and Z

Which of the following is NOT a function of membrane proteins

Which of the following occurs with presynaptic inhibition in a specific neuron

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Match the relationship between the two items, A. and B.., with the qualifications labelled a. through c. (Options may be used more than once or not at all.) -a.amount of Na⁺ transported out of the cell by the Na⁺-K⁺ pump B.amount of K⁺ transported into the cell by the Na⁺-K⁺ pump

Mitochondria are presumed to be descendants of primitive bacterial cells.

Which of the following describes saltatory conduction

Anions are attracted toward a more positively charged area along an electrical gradient.

____________________ is a peroxisomal enzyme that breaks down hydrogen peroxide.

Action potentials may result from hyperpolarization or depolarization.

In which structure do the citric acid cycle reactions occur

Match the result, labelled a. or b., with the force and involved ion in question. (Options may be used more than once or not at all.) -electrical gradient for K⁺ at resting potential

Endocytosis can be accomplished by phagocytosis and pinocytosis.

Discuss the role of channel proteins in establishment of resting and action potentials.

Which of the following is the first step for synaptic signalling when the action potential arrives at the axon terminal of a presynaptic neuron

Which of the following happens to the membrane when chemically gated Na⁺ channels open

Which of these organelles occurs in the lowest numbers within a typical human cell

A balance of IPSPs and EPSPs will negate each other so that the grand postsynaptic potential is essentially unaltered.

Vaults serve as cellular trucks for transport from cytoplasm to nucleus

Match the terms, labelled a. through c., with their characteristics, labelled 1. (Options may be used more than once or not at all.) -takes place in the cytosol

Which of these statements describes passive diffusion