High School
Quote: “Humans are unique among primates in that they alone practice obligatory bipedalism and their skeletons show distinctive adaptations for this form of locomotion.”
Quote: “Tracking mutations in viruses can help determine where an outbreak started and how it spread. Understanding how virus populations change over time can also help scientists develop treatments and vaccines.”
Quote: “This image shows E. coli cells expressing green fluorescent protein (GFP). Note that though the cells are genetically identical, they are expressing different amounts of proteins.”
Quote: “This fibroblast is responding to a hormone by producing and releasing proteins. These proteins will form the glue that holds the cells in a tissue together.”
Quote: “The cerebellum (Latin for "little brain") may be small, but it contains about 70 billion neurons (five times as many neurons as the physically larger cerebral cortex).”
Quote: “The Virtual Brain Model software is a unique electronic library of human brain anatomy designed to improve teaching and learning of the spatial relationships of 79 key structures and functional pathways in the nervous system.”
Quote: “In an attempt to conceive of the enormity of the nervous system, the number of neurons in the human brain has been equated to the number of stars in the milky way.”
Quote: “Many areas of the brain work together and/or independently to maintain body functions. This occurs through a complex network of interconnecting neural pathways, and is the focus of current research in brain mapping.”
Quote: “To learn about the different regions of the human brain, there is text accompanying the model providing insights on brain functions associated with the selected region.”
Quote: “The neuron is an excitable cell. It is capable of responding to a preliminary stimulation - that is a threshold stimulation - via the generation of an action potential.”
Quote: “Active movement of molecules and ions across the membrane is related to the membrane structure and the availability of free energy.”
Quote: “A description of the electrical properties of the membrane and how this membrane works in the cylindrical geometry of the axon.”
Quote: “To transmit signals, neurons release neurotransmitters that diffuse through the synapse and activate the next neuron in the signaling network.”
Quote: “Is this a speeding up, slowing down, or constant speed motion? Is the object experiencing balanced or unbalanced forces?”
Quote: “An action potential occurs when a portion of the membrane rapidly depolarizes and repolarizes again to the original resting state. This process is initiated by a threshold level.”
Quote: “A rightward-moving car is skidding to a stop across a level roadway with locked wheels. Ignore air resistance.”
Quote: “I'm sure you've heard of Isaac Newton and maybe of some of his laws. Like, that thing about "equal and opposite reactions" and such. But what do his laws mean? And how do they help us understand the world around us? In this episode of Crash Course Physics, Shini talks to us about just that.”
Quote: “Melting, vaporization, and sublimation are known as endothermic processes, because the matter needs to absorb heat to occur."
Quote: “Let's say you had a container of liquid, and you wanted to increase the temperature, you'd probably add heat. But how much heat should you add?"
Quote: “The non-bonded atomic radius of an atom is half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced.”
Quote: “Francium, a very large atom with only one valence electron, will be easy to ionize because the electron is so far away from the nucleus and atoms like to have their outermost shell completely full.”
Quote: “N3- is potentially a very unstable anion. If you heat it, it can turn to nitrogen gas. N2 has a very strong bond between the two nitrogen atoms, so it releases a lot of energy.”
Quote: “Elements are primary constituents of matter that cannot be created or broken down through normal chemical reactions.”
Quote: “Work out the compounds in the blank squares. Every row, column and 3x3 box contains a chloride, bromide, iodide, oxide, hydroxide, nitrate, carbonate, sulfate and phosphate.”
Quote: “Neurons encode information with electrical signals and transmit that information to other neurons by synapses.”
Quote: "Stimulate a neuron and monitor what happens. Pause, rewind, and move forward in time in order to observe the ions as they move across the neuron membrane."
Quote: "Examine kinetic energy and speed histograms for light and heavy particles."
Quote: “Next, you'll place the swab into an Eppendorf tube. Look closely at the swab. Note that it is covered with hundreds of tiny cheek cells. Inside each cheek cell is a nucleus, and inside the nucleus is DNA.”