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Review of the 5 Human Senses Sight Sound Touch Taste Smell. Regulation Our environment, both inside and outside our body, is constantly changing. Regulation is the life process by which cells and organisms respond to changes within and around them. .
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Our environment, both inside and outside our body, is constantly changing. Regulation is the life process by which cells and organisms respond to changes within and around them.
In humans, regulation is carried out by the nervous system and the endocrine system. These two systems allow us to adjust to internal as well as external environmental changes, which enables us to maintain ________________
Regulation by an organism begins when the organism encounters a _______________________
The neuron or nerve cell is the basic unit of the nervous systemIt is composed of three parts: 1) The cyton or soma 2) Axon 3)Terminal branches
The nerve impulse is an electrochemical transmission of the nerve signal along the length of the neuron. A stronger stimulus will not produce a larger nerve impulse, but will produce more impulses in a given time period
The effector cell is the cell that performs the action specified by the nerve impulse. In humans, effector cells are either muscle cells which contract, or glands which secrete.
Once the stimulus is perceived by the receptor, a nerve impulse travels along the axon to the ends of the terminal branches. There is a small gap between the terminal branches and the next cell. This gap is called a SYNAPSE
The nerve impulse crosses the synapse through the action of special chemical messengers released by the terminal branches of the sensory neuron and received by another neuron
The sensory neuron will lead to either another sensory neuron, the brain, or an interneuron cell within the spinal cord. An interneuron cell in the spinal cord can transmit the nerve impulse either to the brain or to a motor neuron. A motor neuron will carry the signal away from the spinal cord and toward an effector cell.