The Risk of Down Syndrome Increases Sharply, Especially After Age

question 86

Multiple Choice

The risk of Down syndrome increases sharply, especially after age ______.

• A) 30
• B) 33
• C) 35
• D) 40

---

Definitions:

Presynaptic Membrane

A region of the neuron that releases neurotransmitters in response to an action potential.

Postsynaptic Membrane

The part of the neuron or muscle cell that receives signals from another neuron at a synapse.

Storage Granule

Membranous compartment that holds several vesicles containing a neurotransmitter.

Serotonergic System

A part of the nervous system that utilizes serotonin as its neurotransmitter, playing a crucial role in regulating mood, appetite, and sleep.