Which Part of the Embryo Contributes to the Fetal Portion

question 52

Multiple Choice

Which part of the embryo contributes to the fetal portion of the placenta?

• A)trophoblast
• B)hypoblast
• C)inner cell mass
• D)epiblast

---

Definitions:

Permeability

A measure of the ability of a substance to allow liquids or gases to pass through it.

Absolute Refractory Period

A period immediately following the firing of a nerve fiber when it cannot be stimulated no matter how great a stimulus is applied.

Repolarization

The process of restoring the resting negative charge inside the cell membrane after depolarization, crucial for the propagation of electrical signals in nerve and muscle cells.

Action Potential

A rapid change in the electrical charge across a cell membrane that results in a nerve or muscle cell firing.