1. What allows a cell to stockpile substances in greater concentration than they occur outside the cell? is it active transport?
2. The sodium potassium pump prevents the accumulation of what ions inside the cell?
3. Conduction of nerve impulses is possible because of what? ion channels?
1. Yes, active transport allows a cell to stockpile substances in greater concentration than they occur outside the cell. Active transport involves the movement of molecules or ions across a cell membrane against their concentration gradient, from an area of lower concentration to an area of higher concentration. This process requires the expenditure of energy, typically in the form of ATP (adenosine triphosphate), to pump molecules or ions across the membrane. Examples of active transport mechanisms include the sodium-potassium pump and the proton pump.
To determine if active transport is the correct answer, you can think about the question and recall your knowledge about cellular processes. Understanding that active transport involves the movement of molecules against their concentration gradient and the requirement of energy for the process can lead you to the correct answer in this case.
2. The sodium-potassium pump prevents the accumulation of sodium ions (Na+) inside the cell. The sodium-potassium pump is a type of active transport protein found in the cell membrane of most animal cells. It actively transports three sodium ions out of the cell for every two potassium ions it brings into the cell. By doing so, it helps maintain the concentration gradient of sodium ions, ensuring that they do not accumulate inside the cell.
To find the answer to this question, you need to recall information about the function of the sodium-potassium pump and its role in maintaining the balance of sodium and potassium ions across the cell membrane.
3. Yes, the conduction of nerve impulses is possible because of ion channels. Ion channels are specialized protein structures found in the cell membrane of neurons (nerve cells) that allow the passage of specific ions, such as sodium (Na+), potassium (K+), and calcium (Ca2+), across the membrane. These ion channels can be gated, meaning they can open and close in response to certain signals.
When a nerve impulse, also known as an action potential, is generated, ion channels open and allow the flow of ions across the cell membrane. This movement of ions creates changes in the electrical potential across the membrane, leading to the propagation of the nerve impulse along the neuron.
To determine the correct answer, you need to understand the role of ion channels in the conduction of nerve impulses and recall your knowledge about the basic mechanisms of neuronal communication.