List the steps involved in neurotransmitter release starting with depolarization and ending with exoctosis. Include 1) the relevant channel and dynamics of the transmembrane domains and subunits; 2) ionic movements; 3) the various stages of the vesicles and the proteins involved as well as their configurations. There are 4 main steps that you should include.

When the protein integrin (a transmembrane protein in human fibroblasts) is held in place, by covalent bonds to fibronectin and collagen proteins in the interstitial spaces, integrin is exhibiting:  restricted movement in the membrane, based on confinement by diffusion barriers restricted movement in the membrane, based on tethering to extracellular molecules restricted movement in the membrane, based on attachment to other cells restricted movement in the membrane, based on anchoring to intracellular proteins unrestricted movement in the membrane, similar to membrane lipids

What is an electrochemical gradient? What is responsible for the generation of the resting membrane potential?

What is the correct rank the following molecules in regards to membrane permeability from MOST (1) to LEAST (4) permeable ? Each number can be used only once. Na+ (sodium ion) [ Choose ] [Choose] CO2 (carbon dioxide) 1 4 Glucose 2 H20 (water) [Choose]

A 48-year-old man has hepatic cancer that is unresponsive to standard therapy. He enrolls in a clinical study of a novel chemotherapeutic agent that, as a side effect, blocks kinesin, a component of the cellular microtubular transport system. One week later, he develops skeletal muscle weakness An alteration in which of the following components of the neuromuscular junction is the most likely cause of the muscle weakness? (A) A decrease in the number of postsynaptic neurotransmitter receptors (B) A decrease in the number of presynaptic neurotransmitter vesicles (C) A decrease in the presynaptic neuron calcium permeability (D) Impaired a-motoneuron action potential conduction (E) Impaired skeletal muscle action potential conduction

For each type of membrane transport, know the following:– Is a transporter protein required? If so, what type?– Is there an energy requirement, and if so, what is the energy source?– What is the relative rate of solute transport based on molecule type? On concentration gradient?– What are examples of the types of solutes transported by carriers and channels?

During a microscopy exercise in the anatomy laboratory,a student makes the following observations about a tissuesection: (1) The section contains some different types ofscattered protein fibers—that is, they exhibit differentwidths, some are branched, some are long and unbranched,and their staining characteristics differ (some are seenonly with specific stains). (2) Several cell types withdifferent morphologies are scattered throughout the section,but these cells are not grouped tightly together. (3) Theexamined section has some “open spaces”—that is, placesbetween cells and the observed fibers in the section thatappear clear with no recognizable features. What type oftissue is the student observing? Where might this tissue befound in the body?

With respect to the cell body of a neuron, which of the following statements is false? a. Aggregates of Golgi apparatus and lysosomes form darkstaining Nissl bodies within it. b. Reflecting its function of protein synthesis, the cell body contains a high density of ribosomes, rough endoplasmic reticulum, and Golgi apparatus. c. Within its cytoplasm are bundles of intermediate filaments that come together to form neurofibrils. d. The cell body has high metabolic demands, and thus has large numbers of mitochondria.

Two scientists calculated the membrane potential of a neuron using two different equations, the Nernst equation and the Goldman equation. Their calculations gave them slightly different predictions. What is the most likely reason for this difference? The lipid compositions of the cell membranes that the scientists studied were different. The scientists placed their measuring electrodes in slightly different positions. The temperatures of the fluid surrounding the cell membranes were different. The numbers of ions considered in the calculations were different. The scientists measured different numbers of cells.

In general, what is the relationship between membrane fluidity and membrane permeability?