Key Idea.
Section 1
Sense Receptors Gather Information
The sensory system functions as an information-gathering network. Sense receptors located throughout the body constantly monitor the environment for stimuli.
A stimulus is any change in the environment—such as a noise, a flash, or a texture—that triggers a response. These receptors are the body's first line of contact with the outside world.
Section 2
Receptors Send Signals to the Brain
Once a stimulus is detected, the receptor converts that physical event into a biological message called a signal. These signals are transmitted along a network of nerves that connect the sensory organs to the central processing unit: the brain.
This transmission is rapid, allowing the body to relay information from the fingertips or eyes to the brain in a fraction of a second.
Section 3
The Brain Decodes Sensory Messages
The final step of sensation occurs in the brain. The brain receives the electrical signals from the nerves and decodes them. It interprets these signals to create a conscious perception of the world.
Without the brain's processing, the signals would be meaningless data. It is the brain that ultimately decides what we are seeing, hearing, or feeling, and determines how the body should respond to that information.
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Section 1
Sense Receptors Gather Information
The sensory system functions as an information-gathering network. Sense receptors located throughout the body constantly monitor the environment for stimuli.
A stimulus is any change in the environment—such as a noise, a flash, or a texture—that triggers a response. These receptors are the body's first line of contact with the outside world.
Section 2
Receptors Send Signals to the Brain
Once a stimulus is detected, the receptor converts that physical event into a biological message called a signal. These signals are transmitted along a network of nerves that connect the sensory organs to the central processing unit: the brain.
This transmission is rapid, allowing the body to relay information from the fingertips or eyes to the brain in a fraction of a second.
Section 3
The Brain Decodes Sensory Messages
The final step of sensation occurs in the brain. The brain receives the electrical signals from the nerves and decodes them. It interprets these signals to create a conscious perception of the world.
Without the brain's processing, the signals would be meaningless data. It is the brain that ultimately decides what we are seeing, hearing, or feeling, and determines how the body should respond to that information.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter