Chapter 14 - Coordination and Response : Nervous System

nerve impulses

The pathway by which ________ travel during reflex actions is called a reflex arc.

stimulus

a change in the environment that causes an organism to react.

sensory receptors

Detects the stimulus

Bodily functions

________ are classified into voluntary actions and involuntary actions.

Dendrons

________ are branched projections that conduct nerve impulses towards the cell body.

synapse

a junction between two neurones or between a neurone and an effector.

Reflex actions

are involuntary responses to a specific stimulus.

sensory neurone

has a smooth and rounded cell body, a single long dendrite and a short axon.

nerve impulses

stimulate the motor end plate and cause the muscle to contract.

Voluntary actions

________ are actions that are consciously controlled.

dendron

The ________ is structurally similar to an axon and is myelinated.

motor neurone

consists of a cell body and a long thin axon covered by a myelin sheath.

Involuntary actions

actions that cannot be consciously controlled, such as heartbeat, peristalsis, vasoconstriction and reflex actions.

reflex arc

The pathway by which nerve impulses travel during reflex actions