How Do Sensory Organs Convey Information to the Brain?
I. Introduction A. The type and sensitivity of sensory systems varies among different animals. B. Sensory Transduction C. Transmitting Information to the Brain 1. Receptor cells tend to be highly specialized. 2. Each sensory neuron sends its information to a specific portion of the brain. 3. Different regions of the brain are specialized for interpreting different types of stimuli. II. Hearing A. Hearing is the ability to sense changes in pressure called sound. B. How do sensory cells respond to sound waves and other forms of pressure? 1. Direct physical pressure on a cell membrane, 2. Many pressure receptors are similar to hair cells. (Fig. 43.4) C. The Mammalian Ear (Fig. 43.5) 1. In the ear, airborne sound waves are translated into water-borne waves. 2. The outer ear consists of the tympanic membrane and ear canal. 3. The middle ear amplifies sound. 4. The inner ear contains the fluid-filled cochlea. 5. The cochlea detects the frequency of sounds. D. Sensory Worlds: What Do Other An
