Animal Science Nervous System. Co-Ordination Adjustments of an animal’s response to changes in the environment Require complex linking of various systems.

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The Nervous System Chapter 35.

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Presentation transcript:

Animal Science Nervous System

Co-Ordination Adjustments of an animal’s response to changes in the environment Require complex linking of various systems Nervous & Endocrine –1 st operates via electrical impulses –2 nd releases chemicals or hormones

Sensory Function Sense changes both outside and within the body Example: Eyes sense change in light

INTEGRATIVE FUNCTION Processing the information received form the sense organs Impulses are analyzed and stored as memory Impulses are sorted, synchronized, and coordinated and the proper response is initiated

Motor Function Response to the stimuli that causes muscles to contract Example: Fancy foot work with a soccer ball

Motor Function Continuous Tasks Performance level is just as proficient as before even after years of no use. Example: ? Discrete Tasks Performance level drops but will still be better than a new learner. Example: ?

Neuron

Neurons are cells that have been adapted to carry nerve impulses

Neurons transmit high-speed signals called nerve impulses. Nerve impulses are similar to an electric current.

Dendrites-conduct nerve impulses towards the cell body Axon-carries the impulses away from it Myelin-fatty material around the sheath Axons & Myelins speeds up the rate at which the nerve impulses travel along the nerve

Cell body of neurons located in brain or spinal cord Axons extend to the organ that it supplies Nerve-bundle of axons

Types of Neurons Sensory Neuron-nerve cell that transmits impulses from a sense receptor Motor Neuron-nerve cell that transmits impulses from the brain or spinal cord to a muscle or gland Relay Neuron-connects sensory and motor neurons

Connections Between Neurons Connection between neurons=synapse Neurotransmitters are chemicals that are in the gap between the neurons When the neurotransmitters contact the membrane of the adjacent neuron they stimulate a NEW nerve impulse

Reflexes Reflex-rapid automatic response to stimulus Reflex arc-path taken by the nerve impulses

Follow Me… The stimulus (pin in the paw) stimulates the pain receptors in the skin This initiates an impulse in a sensory neuron Impulse travels to the spinal cord Impulse passes(by means of a synapse) to a connecting neuron called the relay neuron Relay makes a synapse with one or more motor neurons that transmit the impulse to the muscles. Causes muscles to contract and remove the paw

Got it?

HOW DO ANIMALS MOVE?ANIMALS