Exam 2: Cell Physiology

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.A is greater than B b.B is greater than A c.A and B are equal -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

Which of the following statements applies to membrane potential?

Neuropeptides are large, ____________________ acting molecules.

Match the vesicles, labelled a. through c., with their characteristics. (Options may be used more than once or not at all.) a.transport vesicles b.coated vesicles c.secretory vesicles -originate from the endoplasmic reticulum

A plasma membrane has a polarization if it separates particles with an opposite ____________________.

Electron microscopes are about 100 times more powerful than light microscopes.

Match the terms, labelled a. through d., to their descriptions. (Options may be used more than once or not at all.) a.microtubules b.microfilaments c.intermediate filaments d.micro trabecular lattice -composed of tubulin

____________________ diffusion allows materials to pass through the membrane by a carrier protein without the expenditure of energy.

Describe the differences between rough ER and smooth ER.

Gap junctions play an important role in transmission of impulses for heart contraction.

____________________, an enzyme found in peroxisomes, decomposes potentially toxic hydrogen peroxide.

The ____________________ equation equates the equilibrium potential for an ion with the ion's concentration difference outside and inside the cell.

Which of these terms best describes an excitable condition when a resting membrane potential is present?

Secretory vesicles are released to the exterior of the cell by means of the process of phagocytosis.

Match the terms, labelled a. through d., to their descriptions. (Options may be used more than once or not at all.) a.microtubules b.microfilaments c.intermediate filaments d.micro trabecular lattice -provide a pathway for axonal transport

The nerve fibre is another name for the nucleus of a neuron.

During conduction by local current flow, current flows locally between the active and the adjacent inactive area of the cell membrane, thereby decreasing the potential in the inactive area to threshold.

Pinocytosis is a form of which of the following processes?

Match the terms, labelled a. through f., to their correct descriptions. (Options may be used more than once or not at all.) a.plasma membrane b.nucleus c.cytoplasm d.cytosol e.organelles f.cytoskeleton -site of fat and glycogen storage

Presynaptic neurons converging upon a postsynaptic cell will be either all excitatory or all inhibitory.