| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.34 |
| Score | 0% | 67% |
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
diaphragms |
|
blood cells |
|
bronchioles |
|
capillaries |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
The heat from the Sun traveling to Earth is an example of which of the following?
radiation |
|
electricity |
|
convection |
|
conduction |
Radiation occurs when electromagnetic waves transmit heat. An example is the heat from the Sun as it travels to Earth.
Saturated fats can __________ LDL ("bad") cholesterol while unsaturated fats can __________ it.
decrease, stabilize |
|
decrease, raise |
|
raise, decrease |
|
stabilize, raise |
Saturated fats can raise LDL ("bad") cholesterol while unsaturated fats can decrease it.
Which of the following is not true about mass and weight?
weight is the force exerted on an object by gravity |
|
mass is the amount of matter something has |
|
mass depends on the location where it is measured |
|
weight depends on the location where it is measured |
Mass is the amount of matter something has while weight is the force exerted on an object's mass by gravity. So, although a person's mass doesn't change when going from the Earth to the Moon, their weight will decrease because the force of the Moon's gravity is much less than that of Earth.
The two heart chambers that collect blood are called:
ventricles |
|
atria |
|
valves |
|
aorta |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.