B.
The tundra climate is a transitional climate between the Subarctic and ice cap climates. It is a region of rolling to nearly level terrain almost entirely devoid of trees. Polar climates like the tundra are characterized by very cold temperatures and generally dry conditions.
When the neuron is at rest, what is primarily responsible for moving potassium ions OUT of the cell?
a concentration gradient
an electrical gradient
both a concentration gradient and an electrical gradient
the sodium-potassium pump
Answer:
a concentration gradient
Explanation:
At rest, the sodium-potassium pumps pump the two potassium ions into the cell for three Na ions moved out of the cell. This creates a higher potassium concentration gradient inside the cell. This concentration gradient moves the K+ out of the cell. Movement of positively charged K+ out of the cells make the inside of the membrane negative with respect to the outside. This is how the negative resting potential is maintained when neurons are nor firing the action potential.
Answer:it’s C
Explanation:got it right on the quiz
The by-products that cellular respiration include are carbon dioxide and water<span>.</span>
Answer:
Vital capacity can be defined as the maximum volume of air a person can breathe in after a forced expiration. It is equivalent to the sum of expiratory reserve volume (ERV), tidal volume (TV) and inspiratory reserve volume (IRV).
- Expiratory reserve volume (ERV): It refers to the volume of air a person can exhale by forcible expiration or air exhaled from the end-expiratory position.
- Tidal volume (TV): It is a volume of air inhaled or exhaled during a normal respiration.
- Inspiratory reserve volume (IRV): Maximum volume of air a person can inhale from the end-respiratory position.
Now, the vital capacity of John would be = 450 + 2600 + 900 ml
= 3950 ml or 3.95 L.
