The four different types of general sensory receptors include mechanoreceptors, thermoreceptors, chemoreceptors and nociceptors. Mechanoreceptors, thermoreceptors and nociceptors are categorized as somatosensory receptors responsive to mechanical displacement, temperature and pain, respectively, while chemoreceptors respond to chemical stimuli. Receptors respond to multiple stimuli and are therefore categorized by their lowest threshold.Know More
Mechanoreceptors respond to a wide array of external and internal stimuli, such as touch, pressure, stretching, movement, itching and vibration. They function by sending signals to the central nervous system when their membranes are displaced. These can be further grouped into three smaller categories by what causes their signal transmissions: position and velocity receptors, velocity receptors and transient receptors.
Thermoreceptors detect temperature within and outside of the body. Externally, warm receptors and cold receptors detect temperature increases and decreases within the range of 59 to 109 degrees Fahrenheit. Nociceptors recognize pain associated with extreme mechanical, temperature and chemical stimulation.
External chemoreceptors concern taste and smell, and internal chemoreceptors monitor blood chemistry in the carotid body, aorta and brainstem. Taste receptors in the taste buds and smell receptors in the olfactory epithelium are closely linked and activated by similar stimuli. Messages to the brain from internal chemoreceptors do not result in a conscious sensation.Learn more about Nerves
Sensory nerves carry signals from organs that respond to stimuli to the spinal cord and brain. The information that travels from one point to another does so via the central nervous system.Full Answer >
The sensory system is responsible for detecting stimuli from the outside world and transferring nervous impulses to the correct portion of the brain or spinal column to allow the body to react. The sensory system consists of the eyes, ears, nose, tongue, skin and their associated nerves.Full Answer >
The brain is made up largely of neurons, or nerve cells, blood vessels and glial cells. Glial cells create a supporting structure for the brain. The brain is about 60 percent fat.Full Answer >
Though there are over 10,000 specific types of neurons, the three general classifications are sensory neurons, motor neurons and interneurons. Sensory neurons send signals from outside the body into the central nervous system, motor neurons transmit signals to activate muscles and glands, and interneurons act as connectors between neurons.Full Answer >