| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.58 |
| Score | 0% | 72% |
What prevents blood pumped out of the ventricles from flowing back into the heart?
atria |
|
platelets |
|
capillaries |
|
valves |
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.
A dominant trait will be expressed when paired with:
a gene |
|
a dominant trait |
|
a recessive trait |
|
a chromosome |
The traits represented by genes are inherited independently of each other (one from the male and one from the female gamete) and a trait can be dominant or recessive. A dominant trait will be expressed when paired with a recessive trait while two copies of a recessive trait (one from each parent) must be present for the recessive trait to be expressed.
In fermentation, what replaces oxygen in anaerobic respiration?
lactic acid or alcohol |
|
water |
|
ascorbic acid or peptides |
|
starches |
If no oxygen is present, cellular respiration is anaerobic and will result in fermentation where either lactic acid or alcohol is used instead of oxygen.
The heat from the Sun traveling to Earth is an example of which of the following?
radiation |
|
convection |
|
conduction |
|
electricity |
Radiation occurs when electromagnetic waves transmit heat. An example is the heat from the Sun as it travels to Earth.
In the metric system, what prefix represents 103?
centi |
|
kilo |
|
mega |
|
milli |
Kilo is the metric system prefix for 103.