(Q).
Q: The outer surface of the heart changes from positive to negative during what? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - inflammation - permeability - reproduction - depolarization A:
(A).
depolarization

(Q).
Q: Sugars, starches, and cellulose are examples of what biochemical compounds that organisms use for energy? Read this paragraph and choose the correct option from the provided answers: Carbohydrates are biochemical compounds that include sugars, starches, and cellulose. They contain oxygen in addition to carbon and hydrogen. Organisms use carbohydrates mainly for energy. Choices: - calories - prokaryotes - proteins - carbohydrates A:
(A).
carbohydrates

(Q).
Q: What is the opposite of melting? Read this paragraph and choose the correct option from the provided answers: All of the changes of state that occur between solid, liquid and gas are summarized in the diagram in the figure below. Freezing is the opposite of melting and both represent the equilibrium between the solid and liquid states. Evaporation occurs when a liquid turns to a gas. Condensation is the opposite of vaporization and both represent the equilibrium between the liquid and gas states. Deposition is the opposite of sublimation and both represent the equilibrium between the solid and gas states. Choices: - evaporation - liquidation - compression - freezing A:
(A).
freezing