Choose the correct sequence of events:

action potential reaches synapse—acetylcholine is released by motor neuron—calcium ions enter motor neuron—sodium ions flood into the muscle cell—acetylcholine binds to gated ion channels on sarcolemma, transferring the action potential.

action potential reaches synapse—calcium ions enter motor neuron—acetylcholine is released by motor neuron—acetylcholine binds to gated ion channels on sarcolemma—sodium ions flood into the muscle cell, transferring the action potential.

action potential reaches synapse—acetylcholine is released by motor neuron—acetylcholine binds to gated ion channels on sarcolemma—calcium ions enter motor neuron—sodium ions flood into the muscle cell, transferring the action potential.

none of these.
action potential reaches synapse—calcium ions enter motor neuron—acetylcholine is released by motor neuron—acetylcholine binds to gated ion channels on sarcolemma—sodium ions flood into the muscle cell, transferring the action potential.

Which organelles are involved in energy conversion

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i.e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.