The intracellular calcium ion concentration of ventricular muscle cells averages 10-4 mmol/l during diastole. the calcium ion concentration in transverse tubules (t-tubules) averages 2.5 mmol/l at rest. a protein transporter on the membrane of the t-tubule exchanges sodium for calcium. the transporter uses the transmembrane sodium gradient to fuel the exchange. which of the following transport mechanisms best describes this type of transporter?
a. facilitated diffusion
b. primary active transport
c. secondary active co-transport
d. secondary active counter-transport
e. simple diffusion

Chapter 1 what is the sociological perspective? why did durkheim say that some people are more likely to commit suicide? what does it mean that sociology us to see that “things are not as they seem"? what is the "sociological imagination"? how did industrialization and urbanization lead to the development of sociology? who is the "father" of sociology (and coined the term sociology)? what was the major goal of sociology’s pioneers like comte and durkheim? what did herbert spencer say? what did karl marx think caused social change? when did sociology become established as an academic discipline in the u. s.? what did w. e.b. dubois say was the major problem of the 20th century? what is the functionalist view of society? what is the main focus of the conflict perspective? why are gender and race important to the conflict perspective? what is the symbolic interactionist perspective? chapter 2 why is culture vital to human survival, and how is that different from animal instinct? what is the sapir-whorf hypothesis? what is a norm? what are mores and folkways? how does the u. s. compare to other nations in terms of how multicultural or culturally diverse it is? what is a subculture? what is a counterculture? what is cultural lag? can you give an example? what is the ethnocentrism vs. cultural relativism debate about?

According to the chart, the power to tax is a concurrent power, meaning a) it belongs to the state government. b) it is a government power that is shared. c) it is less important than the power to borrow money. eliminate d) it is more important than the regulating state trade.

Which of the following is a problem in the health care system of the united states? a. too many doctors in rural areas b. too many doctors who are general practitioners c. fraud d. costs that are too low