Neurotransmitters Being Released by a Presynaptic Neuron into the Synapse

question 191

Multiple Choice

Neurotransmitters being released by a presynaptic neuron into the synapse are due to,____.

• A) the neuron being in a refractory period
• B) a large concentration of Na+ ions outside of the presynaptic axon
• C) a high concentration of negative ions inside the neuron
• D) action potentials that have occurred in the presynaptic neuron

---

Definitions:

Soil Organisms

A diverse group of living entities in soil, including bacteria, fungi, insects, and earthworms, contributing to nutrient cycling and soil health.

Prenatal Development

The process of growth and development within the womb from conception to birth.

Periods

Segments of time into which time is divided, often used in reference to historical epochs or women's menstrual cycles depending on context.

Hormone Production

The process by which glands in the body produce hormones, which are chemical substances that regulate various physiological functions.