Question Detail
Question
Which of these molecules are pumped into the forming blastocoel? a. Sodium and water b. Calcium and Sodium c. Calcium and water d. Sodium and Calcium
Correct Answer
Option A is the correct answer.
Detailed Explanation
The blastocoel, the fluid-filled cavity of the blastula/blastocyst, forms as a result of ion and water transport. Cells of the embryo actively pump sodium ions (Na+) into the intercellular spaces. This creates an osmotic gradient that draws water in, forming the cavity.
Hint
The ion that's key for fluid balance (salt) and the water that follows it.