Most Vital Organ and System Structures Are Formed During the ____________________

question 17

Short Answer

Most vital organ and system structures are formed during the ____________________ trimester.

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Definitions:

Refractory Period

A time right after stimulation when a nerve or muscle cannot respond to additional stimulation.

Neuronal Membrane

The phospholipid bilayer that encases a neuron, allowing for the regulation of ion flow necessary for transmitting nerve impulses.

Sodium

A chemical element, symbol Na, that is a soft, silvery-white, highly reactive metal and is used in various compounds and biological functions.

Synaptic Cleft

The tiny gap between neurons at a synapse, through which neurotransmitters are released to transmit nerve impulses from one neuron to another.