| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.03 |
| Score | 0% | 61% |
Vector quantities are fully described by which of the following?
a direction only |
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a magnitude and a direction |
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a magnitude only |
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a direction and a polarity |
Velocity and displacement are vector quantities which means each is fully described by both a magnitude and a direction. In contrast, scalar quantities are quantities that are fully described by a magnitude only. A variable indicating a vector quantity will often be shown with an arrow symbol: \(\vec{v}\)
In the heart, blood flows from the right __________ to the lungs then back to the heart via the left __________.
atrium, ventricle |
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ventricle, ventricle |
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atrium, atrium |
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ventricle, atrium |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.
The coldest point in the Earth's atmosphere is reached in which atmospheric layer?
thermosphere |
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mesosphere |
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troposphere |
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stratosphere |
In the mesosphere, temperature again drops as altitude increases until the coldest point in the Earth's atmosphere, the mesopause, is reached where temperatures fall to −225 °F (−143 °C).
In the heart, blood flows from the __________ ventricle to the lungs then back to the heart via the __________ atrium.
right, left |
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left, left |
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right, right |
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left, right |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.
The __________ nervous system regulates involuntary activity in the heart, stomach, and intestines.
autonomic |
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central |
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peripheral |
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somatic |
Part of the peripheral nervous system, the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.