Neurons that respond to stimuli and relay information to the spinal cord and brain.

A narrow cleft between a neuron's output zone and the input zone of a neighbor cell.

These sea animals have the simplest nervous system.

a nerve cord that in growing embryos turns to a brain and spinal cord.

an expressway between the peripheral nervous system and the brain.

Neurons that receive and process sensory neurons information and influence actions of other neurons.

Signaling molecules that diffuse across chemical synapses

All body pars are arranged around a central axis

the system of nerves that include the brain and spinal cord.

the neural tubes gives rise to these three brain parts:

Neurons that relay information away from the brain and spinal cord to muscles and glands.

Most animals transmit impulses by
a. Electrical
b. Chemical

Radial Animals have a loose mesh of nerve cells known as____

the system that includes nerves that extend throughout the body and carry signals back to the brain and spinal cord.

This part of the brain integrates sensory signals

A brief voltage change; the cytoplasmic fluid is positively charged compared to the fluid outside.

neurotransmitters diffuse across the synaptic cleft and bind to ____

Bilateral animals have ___ or ____ at the head end of the organism.

nerves directly connected to the brain

This part of the brain controls hearing and visual processing

This maintains gradients in the nervous system.

neurotransmitters are broken down by _______ in the synaptic cleft.

This invertebrate has two cordlike nerves that run longitudinal.

nerves that carry signals to move the head, trunk, and limbs

This part of the brain is responsible for planning, memory, and behaviors