Question 1
The concentration of calcium inside a cell is 0.3%. The concentration of calcium outside the cell is 0.1%. How could the cell transport even more calcium to the inside?
◦ osmosis
◦ exocytosis
◦ active transport
◦ passive transport
◦ All of the answers are correct.
Question 2
When the ions move across the cell membrane, an electrical potential change results. As you are probably aware, nerves stimulate skeletal muscle movement. When you place your finger on a sharp object (such as a tack), you quickly draw your hand away and develop a sensation of pain. Which types of channels are operating under these conditions to allow nerve conduction and subsequent muscle movement?
Cell showing nucleoids within mitochondria
Two sperms are contacting with the egg cell
Parts of the Cell
A Littoral Cell—Sediment transfer
Electrical Events