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Stells [14]
3 years ago
6

Learning objective: 12.08.05 describe the initiation and propagation of depolarization and repolarization.

Biology
1 answer:
denis-greek [22]3 years ago
7 0
Depolarization is initiated when there is an influx of sodium inside the cell as opposed to repolarization, where potassium exits the cell (occurring after Na+ gates close). Remember that for every 3 Na+ in, there is 2 K+ out. This imbalance helps to stabilize the membrane.
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What’s the difference between a hypothesis and a theory?
Wewaii [24]
A hypothesis is a suggested explanation for an observable problem OR a reasoned prediction of a possible causal correlation among multiple problems. A theory is a tested and well substantiated and unifying explanation for a set of verified and proven factors.
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3 years ago
1. What type of response will a red blood cell have when placed in a hypertonic solution?
GalinKa [24]
Hypertonic solution means the solution with a lower water potential than the cell cytoplasm, such as salt water.

When the red blood cell is put into it, since the cell has a higher water potential than the solution, water molecules will flow from the cell back into the water due to osmosis.

Osmosis is always where water molecules flow from a region of higher water potential to lower, through a semi permeable membrane (Whcih is the red blood cell membrane in this case.)

Since water flowed out of the cell, the cell lose water and shrinks.

Hypotonic solution is where the solution that has a higher water potential than the cell cytoplasm.

So when the red blood cell is put in that solution, the water will flow from the solution into the cell this time, by osmosis.

The red blood cell will then gain so much water that the cell membrane cannot hold all and therefore burst.
7 0
3 years ago
The surface area/volume ratio is an important factor for one celled organisms. As a cell's volume grows, its surface area/volume
Stells [14]

Answer

Use Mitosis to divide and create daughter cells.

Explanations  

Single-celled organisms use mitosis to reproduce. Both growth and reproduction in unicellular organisms are mutually inclusive. When the cell’s volume grows, the ratio of surface area to volume decreases creating challenges in acquisition of nutrients because there will be too much cytoplasm for a given amount of nuclear material , thus the cell divides by mitosis to reproduce daughter cells and the process begins again.

5 0
3 years ago
How is Earth's environment unique in the solar system?
Ber [7]

Answer:

In the entire solar system, the environment of planet earth is unique due to the presence of the atmosphere.

It is responsible for providing carbon dioxide and oxygen which are essential for the presence of life on earth.

Secondly, it helps in keeping the earth warm through the greenhouse effect.

It prevents the entry of harmful radiations of the sun into the atmosphere.

3 0
3 years ago
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Does the PLANT CELL have CHLOROPLASTS?<br> A. Yes<br> B. No
babymother [125]
The answer is A: yes
Hope this helps
6 0
3 years ago
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