Answer:I'm almost sure it's b or d hope this helped
Explanation:
The nucleolus<span> makes ribosomal subunits from proteins and ribosomal RNA, also known as rRNA. </span>
Answer:
The membrane potential of a nerve cell will depolarize if there is an increase in the positive ions inside the cell.
Explanation:
When nerves are in resting potential it is -70mV. In this stage interior of the cell is negatively charged and outside is more positive. When depolarization occurs the inside cell becomes positive.
This is due to the rush of sodium ions into the cell by voltage-gated channels. Now the inside charge is more positive and the chloride ions move out of the cell. Thus outside becomes more negative.
After some time of depolarization stage, potassium ions move out of the cell making the nerve cell again negative. Now the depolarized stage becomes repolarized by the entry of potassium ions.
During depolarization, the potential of the cell is -55mV. When repolarization occurs, it is again -70mV. But the potassium channels are open and some of the potassium ions move out of the cell making the inside environment more negative. This is known as hyperpolarization condition.
This hyperpolarization remains for a short period where action potential can't occur. This period is called the refractory period. Again potassium ions enter into the cell. This results in the resting potential of the neuron again.
Answer:
One of Schwann and Schleiden’s ideas was that <em>cells were originated by spontaneous generation</em>, which was later rejected by Virchow.
Explanation:
Schwann studied animal tissues, and by observing them, he concluded that tissues were made of cells.
Simultaneously, Schleiden arrives at the same conclusion when studying vegetable tissues.
Around 1830, they met and together proposed the first cell theory. The theory stated that:
- Every living being is made of cells.
- Cell is the basic unit of life.
- Cells are originated by spontaneous generation.
Virchow, who studied human tissues, during his observations sow the cell in its dividing process. He then proposed that <u>cells were not originated from spontaneous generation</u>, but they were the product of other pre-existing cells and were originated by <u>cellular division</u>. He rejected the third state of Schwann and Schleiden’s ideas.
