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The Sensory Sys
Things to know about Ch 11 The Sensory System
Question | Answer |
---|---|
What is a sensory receptor? | Part of the nervous system that detects a stimulus. |
What are some categories of sensory receptors based on the type of stimulus? | There are chemo-receptors that respond to chemicals in solution; photo-receptors that respond to light. Thermo-receptors that respond to temperature; and mechano-receptors that respond to movement. |
How do the special and general senses differ in location? | The special senses are in specialized sense organs; the general senses are widely distributed. |
What happens when a sensory receptor adapts to a stimulus? | It fails to respond. |
What are five structures that protect the eye? | The skull bones, eyelids, eyelashes, eyebrows, lacrimal gland, and conjunctiva. |
What is the function of the extrinsic eye muscles? | They pull on the eyeball so that both eyes center on one visual field, a process known as convergence. |
Which cranial nerve carries impulses from the retina to the brain? | Optic |
What are the three tunics of the eyeball? | The fibrous tunic is the outermost; the vascular tunic is the middle tunic; the nervous tunic is the innermost tunic. |
What are the structures that refract light as it passes through the eye? | The cornea, aqueous humor, lens, and vitreous body. |
What is the function of the ciliary muscle? | It contracts and relaxes to regulate the thickness of the lens and allow accommodation for near and far vision. |
What is the function of the iris? | Adjusts the size of the pupil to regulate the amount of light that enters the eye. |
What are the receptor cells of the retina? | The rods and cones. |
What are four errors of refraction? | Hyperopia, myopia, astigmatism, and presbyopia. |
What is cloudiness of the lens called? | Cataract |
What disorder is caused by excess fluid pressure in the eye? | Glaucoma |
What are the three divisions of the ear? | Outer, middle and inner. |
What are the names of the ear ossicles, and what do they do? | Malleus, incus, and stapes. |
What are the two fluids found in the inner ear, and where are they located? | The endolymph, found in the membranous labyrinth; The perilymph , found around the membranous labyrinth in the bony labyrinth. |
What is the name of the hearing organ, and where is it located? | The spinal organ (organ of Corti) located in the cochlear duct within the cochlea. |
Where are the receptors for equilibrium located? | Located in the vestibule and semicircular canals of the inner ear. |
What are the two types of hearing loss? | Conductive hearing loss and sensorineural hearing loss. |
What is the term for an abnormal sensation of spinning? | Vertigo |
What are the special senses that respond to chemical stimuli? | Taste and smell. |
What are five examples of general senses? | Touch, pressure, temperature, position (proprioception) and pain. |
What are proprioceptors and where are they located? | Receptors that respond to change in position. They are located in muscles, tendons, and joints. |
The part of the nervous system that detects a stimulus is a | Receptor |
The bending of light rays as they pass from one substance to another is called | Refraction |
Nerve impulses are carried from the ear to the brain by the | Vestibulococlear (auditory) nerve |
A receptor that senses body position is | Proprioceptor |
A receptor's loss of sensitivity to a continuous stimulus is called | Sensory adaptation |
From superficial to deep, what is the order of the eyeball's tunics? | Fibrous, vascular, nervous |
Which eye structure has the greatest effect on light refraction? | Cornea |
What do receptors in the vestibule sense? | Acceleration |