How does the chloride ion get into the primary tear Bbl6epuTe oAMH OTBeT: a. Primary active transport b. Via Ca-dependent channel symport together with HCO3- c. Through diffusion d. Passive transport

The correct answer is b. Via Ca-dependent channel symport together with $HCO3-$.<br /><br />In the lacrimal gland, chloride ions are transported into the primary tear through a process called Ca-dependent channel symport. This process involves the simultaneous transport of chloride ions and bicarbonate ions ($HCO3-$) into the tear through a calcium-dependent channel. The influx of calcium ions triggers the opening of these channels, allowing the symport of chloride and bicarbonate ions into the tear. This mechanism helps maintain the ionic balance and pH of the tear fluid.