Body Systems Chapter 29

Central Nervous System

Consists of brain and spinal cord. It is the complex of nerve tissues that control the activities of the body

Peripheral Nervous System

Consists of all nerves outside the brain and spinal cord. Main function is to connect CNS to the organs and limbs

Somatic Nervous System

The somatic Nervous system is Part of the PNS. It deals with skeletal muscle and voluntary movement

Autonomic Nervous System

the part of the nervous system responsible for control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes.


Controls your "Feed and Breed" reactions such as digestion, sexual arousal, urination and defecation


Stimulates your "Fight or Flight" reflex. Also active at a constant level to keep homeostasis going.

Sensory neurons

Convert a specific type of stimulus into action potential.


Transmits impulses between other neurons.

Motor neuron

Located in the spinal cord but spreads outside the spinal cord. Main function is to control muscles and glands

Neuromuscular junction

The point at which a motor neuron makes contact with muscle fiber. It is here that the signal for muscle contraction is able to sent


Organic chemical found in the brain that functions as a neurotransmitter. A neurotransmitter is a chemical that sends signals to other cells

Norepinephrine and epinephrine

They control the body's fight or flight reflex.


A junction between two nerve cells

White Matter

Bundles of axons that connect gray matter areas and transmit nerve impulses

Gray matter

Contains more cell bodies and fewer myelinated axons than white matter

Cerebral cortex

The outer layer of the cerebrum consisting of folded gray matter

Lambic system

Structures are involved in motivation emotion, learning and memory

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