| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.58 |
| Score | 0% | 72% |
The __________ nervous system regulates involuntary activity in the heart, stomach, and intestines.
central |
|
peripheral |
|
somatic |
|
autonomic |
Part of the peripheral nervous system, the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
Which of the following is not true of light waves?
are mechanical waves |
|
can travel through a vacuum |
|
travel faster than sound waves |
|
are electromagnetic waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
Which of the following states of matter exists at the highest temperature?
liquid |
|
gas |
|
none of these |
|
solid |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Which of blood component fights infection?
plasma |
|
platelets |
|
red blood cells |
|
white blood cells |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Which of these is not a component of blood?
marrow |
|
red blood cells |
|
white blood cells |
|
plasma |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.