Describe the function of the pericardial sac around the heart. (2pts) Describe how the blood vessels (arteries and veins) are adapted to transport blood. State at least three physical adaptations for their function. (3pts)
Why is one side of the heart larger in size. Explain. (1pt)
Explain the two types of blood circulation seen in humans. (2pts)

a. List the 4 chambers of the heart and b. list the valves found in the heart also. (4pts)

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.

Which is not true about balanced forces?