Human Nervous System And Sense Organs Pdf

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human nervous system and sense organs pdf

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Nervous system

The nervous system is a network of cells called neurons that coordinate actions and transmit signals between different parts of the body. The nervous system is an organ system that coordinates voluntary and involuntary actions and responses by transmitting signals between different parts of our bodies. Central to the functioning of the nervous system is an extensive network of specialized cells called neurons. Neurons feature many thin projecting fibers called axons, which penetrate deep into tissues. They are able to communicate with other cells by chemical or electrical means at synapses. Neuronal function is supported by neuroglia, specialized cells which provide nutrition, mechanical support, and protection. Major elements in neuron-to-neuron communication : Electrical impulses travel along the axon of a neuron.

The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control of the body and communication among its parts. The brain and spinal cord form the control center known as the central nervous system CNS , where information is evaluated and decisions made. The sensory nerves and sense organs of the peripheral nervous system PNS monitor conditions inside and outside of the body and send this information to the CNS. Efferent nerves in the PNS carry signals from the control center to the muscles, glands, and organs to regulate their functions. The majority of the nervous system is tissue made up of two classes of cells: neurons and neuroglia. Neurons, also known as nerve cells, communicate within the body by transmitting electrochemical signals.

sense organs and their functions pdf

The sensory nervous system is a part of the nervous system responsible for processing sensory information. A sensory system consists of sensory neurons including the sensory receptor cells , neural pathways , and parts of the brain involved in sensory perception. Commonly recognized sensory systems are those for vision , hearing , touch , taste , smell , and balance. In short, senses are transducers from the physical world to the realm of the mind where we interpret the information, creating our perception of the world around us. The receptive field is the area of the body or environment to which a receptor organ and receptor cells respond. For instance, the part of the world an eye can see, is its receptive field; the light that each rod or cone can see, is its receptive field.

There are two, types of photoreceptors: rods and cones. Match five Senses and their functions Teach one-to-one correspondence between the senses and their uses with this Kindergarten worksheet. Grade3 sense organs 1. Rods are very, sensitive to light, but do not distinguish colors. Lower frequencies than can be heard are, detected this way. Temporary or permanent blindness can be. The brain tells you the taste of the food you eat.

human being, the concept of temperament extends from cells to. tissues to the central nervous system, sense organs and their functions as.

Nervous System

Home Events Register Now About. Certain cave-dwelling fishes have minute functionless eyes. Before sharing your knowledge on this site, please read the following pages: 1.

Nervous system , organized group of cells specialized for the conduction of electrochemical stimuli from sensory receptors through a network to the site at which a response occurs. All living organisms are able to detect changes within themselves and in their environments. Changes in the external environment include those of light , temperature , sound , motion, and odour , while changes in the internal environment include those in the position of the head and limbs as well as in the internal organs.

Evolving from filter feeding chordate ancestors, vertebrates adopted a more active life style.


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