Answer the following question given this paragraph: Figure 20.33 The outer surface of the heart changes from positive to negative during depolarization. This wave of depolarization is spreading from the top of the heart and is represented by a vector pointing in the direction of the wave. This vector is a voltage (potential difference) vector. Three electrodes, labeled RA, LA, and LL, are placed on the patient. Each pair (called leads I, II, and III) measures a component of the depolarization vector and is graphed in an ECG. Q: The outer surface of the heart changes from positive to negative during what? Choices: - inflammation - permeability - reproduction - depolarization A:
depolarization
Answer the following question given this paragraph: Q: What is a shortage of water that causes the soil to dry from the surface down called? Choices: - overflowage - tidal wave - flood - drought A:
drought
Q: Answer the following question given this paragraph: Photographs of the sky can be darkened by polarizing filters, a trick used by many photographers to make clouds brighter by contrast. Scattering from other particles, such as smoke or dust, can also polarize light. Detecting polarization in scattered EM waves can be a useful analytical tool in determining the scattering source. There is a range of optical effects used in sunglasses. Besides being Polaroid, other sunglasses have colored pigments embedded in them, while others use non-reflective or even reflective coatings. A recent development is photochromic lenses, which darken in the sunlight and become clear indoors. Photochromic lenses are embedded with organic microcrystalline molecules that change their properties when exposed to UV in sunlight, but become clear in artificial lighting with no UV. Take-Home Experiment: Polarization Find Polaroid sunglasses and rotate one while holding the other still and look at different surfaces and objects. Explain your observations. What is the difference in angle from when you see a maximum intensity to when you see a minimum intensity? Find a reflective glass surface and do the same. At what angle does the glass need to be oriented to give minimum glare?. Q: What is used to darken images of the sky? Choices: - close-up filter - uv filter - neutral density filter - polarizing filters A:
A: polarizing filters
Question: Answer the following question given this paragraph: Animals are multicellular eukaryotes in the Animal Kingdom. They are heterotrophic, meaning that they consume other organisms. Animals have specialized cells and often higher levels of organization. This allows them to do things that other eukaryotes cannot, such as move and digest food internally. Animals generally have a simple life cycle. Q: What do heterotrophic animals usually consume? Choices: - soil - minerals - plants - other organisms A:
Answer: other organisms
*Question*
Answer the following question given this paragraph: Melanocytes are located at the bottom of the epidermis. Q: Melanocytes are located in which layer of the epidermis? Choices: - follicle - outer - crust - bottom A:
**Answer**
bottom
(Question)
Answer the following question given this paragraph: Recall that a double bond consists of one sigma bond and one pi bond. In order for a double bond to be formed, each participating carbon atom must have at least one unhybridized p orbital. In a carbon-carbon double bond where both carbons are bonded to two additional atoms, each carbon is sp 2 hybridized. The double bond includes a sigma bond between a hybrid orbital from each carbon and a pi bond between the leftover p orbital from each carbon. The angles between any two bonds for an sp 2 hybridized carbon are approximately 120. Q: What kind of bond consists of one sigma bond and one pi bond? Choices: - beta bond - covalent bond - ionic bond - double bond A:
(Answer)
double bond