| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.85 |
| Score | 0% | 77% |
Changes to an object's speed or direction of motion are caused by which of the following?
work |
|
power |
|
kinetic energy |
|
a force |
Force is applied to change an object's speed or direction of motion.
Small rocks shed by asteroids and comets that reach the earth are called:
meteoroids |
|
meteorites |
|
meteors |
|
shooting stars |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
Which of these is not a recognized blood type?
AB |
|
O |
|
AO |
|
B |
Blood is categorized into four different types (A, B, AB, and O) based on the type of antigens found on the outside of the red blood cells. Additionally, each type can be negative or positive based on whether or not the cells have an antigen called the Rh factor.
Saturated fats can __________ LDL ("bad") cholesterol while unsaturated fats can __________ it.
raise, decrease |
|
stabilize, raise |
|
decrease, stabilize |
|
decrease, raise |
Saturated fats can raise LDL ("bad") cholesterol while unsaturated fats can decrease it.
What is a major difference between the somatic and autonomic nervous systems?
each belongs to a different nervous system |
|
one controls thinking, the other controls feeling |
|
one controls voluntary activity, one controls involuntary activity |
|
one is inherited, the other is learned |
Both are part of the peripheral nervous system. The somatic nervous system sends sensory information to the central nervous system and controls voluntary actions while the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.