Master this deck with 23 terms through effective study methods.
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Dark adaptation is the process by which the eyes adjust to low light conditions. It involves the regeneration of rhodopsin in the rods of the retina, allowing for increased sensitivity to light. This process can take up to 30 minutes to fully adapt.
The main types of deafness are conductive deafness, sensorineural deafness, and mixed deafness. Conductive deafness is tested using Rinne and Weber tests, while sensorineural deafness is assessed through audiometry. Mixed deafness involves both conductive and sensorineural components.
Color vision refers to the ability to perceive differences in wavelengths of light, allowing for the identification of colors. Clinical tests include the Ishihara test for color blindness and the Farnsworth-Munsell 100 Hue test. Color blindness can be classified into types such as red-green, blue-yellow, and total color blindness.
The olfactory pathway begins with olfactory receptors in the nasal epithelium, which send signals through the olfactory bulb, then to the olfactory tract, and finally to the olfactory cortex in the temporal lobe, where smell is processed.
Impedance matching in the middle ear occurs through the ossicles (malleus, incus, stapes) which amplify sound vibrations from the tympanic membrane to the oval window of the cochlea. This mechanism ensures efficient transmission of sound waves from air to the fluid-filled cochlea.
A taste bud is a sensory organ located on the tongue, composed of taste receptor cells, supporting cells, and basal cells. Each taste bud contains microvilli that extend into the taste pore, where they interact with tastants.
The primary taste sensations are sweet (tip of the tongue), salty (front sides), sour (sides), bitter (back), and umami (distributed across the tongue).
The visual pathway begins at the retina, where photoreceptors convert light into electrical signals. These signals travel through the optic nerve, cross at the optic chiasm, and continue via the optic tract to the lateral geniculate nucleus of the thalamus, and finally to the primary visual cortex in the occipital lobe.
Myopia, or nearsightedness, occurs when the eyeball is too long or the cornea is too curved, causing distant objects to appear blurry. It can be corrected with concave lenses, which diverge light rays before they enter the eye.
Rods are photoreceptors that are more sensitive to light and are responsible for night vision, while cones are responsible for color vision and function best in bright light. Rods are more numerous than cones and are concentrated in the peripheral retina.
The three common errors of refraction are myopia (corrected with concave lenses), hyperopia (corrected with convex lenses), and astigmatism (corrected with cylindrical lenses).
Presbyopia is the age-related loss of the eye's ability to focus on close objects due to the hardening of the lens. It is commonly corrected with reading glasses or bifocals.
The primary taste sensations are sweet, salty, sour, bitter, and umami.
Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage. Types include acute, chronic, and neuropathic pain. The pain pathway involves nociceptors, which transmit signals through peripheral nerves to the spinal cord, then to the thalamus, and finally to the somatosensory cortex.
Referred pain is pain perceived at a location other than the site of the painful stimulus. It occurs due to the convergence of sensory pathways in the spinal cord, leading to confusion in the brain about the source of the pain.
A muscle spindle is a sensory receptor located within the belly of muscles, consisting of intrafusal muscle fibers surrounded by a connective tissue capsule. It detects changes in muscle length and the rate of stretch.
UMNLs are characterized by spasticity, hyperreflexia, and weakness without muscle atrophy, while LMNLs present with flaccidity, hyporeflexia, and muscle atrophy. UMNLs affect the brain or spinal cord, while LMNLs affect the peripheral nerves.
Bradycardia is defined as a slower than normal heart rate, typically below 60 beats per minute. It can occur in conditions such as hypothyroidism and during sleep.
Tachycardia is defined as a faster than normal heart rate, typically above 100 beats per minute. It can occur in conditions such as fever and anxiety.
The All or None law states that a neuron will fire an action potential at full strength or not at all, depending on whether the stimulus reaches the threshold level.
The junctional tissues of the heart include the sinoatrial (SA) node, atrioventricular (AV) node, and the bundle of His, which coordinate the electrical signals that regulate heartbeats.
Cardiac output is the volume of blood the heart pumps per minute, calculated as heart rate multiplied by stroke volume. It is significant for assessing the heart's efficiency and overall cardiovascular health.
Shock is a life-threatening condition characterized by inadequate blood flow to the body's tissues. Types include hypovolemic shock, cardiogenic shock, distributive shock, and obstructive shock.