True statement about dark adaptation include:
a. the threshold for light intensity falls
b. it is biphasic
c. the initial adaptation is due to rod adaptation
d. the change in the light intensity threshold is usually around 100 folds

1 Answer

Answer :

the threshold for light intensity falls

Related questions

Description : True statement about dark adaptation include: a. there is a shift in peak spectral sensitivity from 555 nm to 505 nm with dark adaptation b. rods are more sensitive than cone during dark adaptation c. biphasic changes only occur in retina which processes both rods and cones d. all above

Last Answer : all above

Description : True statements about visual adaptation include: a. light adaptation takes longer than dark adaptation b. dark adaptation reaches its maximum in about 20 minutes c. in dark adapted eye, a higher intensity ... wear red goggles in the light adapt quicker in the dark than those who do not wear them

Last Answer : in dark adapted eye, a higher intensity of light is required to stimulate cones than rods

Description : With regard to dark adaptation: a. is a quicker process than light adaptation b. the sensitivity of the cones increases more rapidly than the rods c. it is monophasic in rod monochromatism d. the first limb of the curve represents rod recovery

Last Answer : it is monophasic in rod monochromatism

Description : When a certain beam of light falls upon a metal surface, it ejects photoelectrons from it. The number of photoelectrons ejected per second by the beam of light depends upon one of the following. Is it ... the work function of the metal y) the frequency of the beam z) the intensity of the beam

Last Answer : ANSWER: Z -- THE INTENSITY OF THE BEAM

Description : The following are true about dark adaptation: a. only regeneration of rhodopsin is responsible b. adaptation usually takes about 20 minutes c. dilatation of pupil plays a part in dark adaptation d. it is better with the fovea than the peripheral retina

Last Answer : dilatation of pupil plays a part in dark adaptation

Description : Visual-evoked response: a. is used primarily to detect visual loss due to retinal disease b. produces biphasic wavefronts c. may give falsely delayed latency if the patient is not concentrating d. produces responses in normal subjects with a latency of 100msec

Last Answer : produces responses in normal subjects with a latency of 100msec

Description : When we migrate from dark to light, we fail to see for sometime but after a time visibility becomes normal. It is example of (a) accomodation (b) adaptation (c) mutation (d) photoperiodism.

Last Answer : (b) adaptation

Description : Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen? A.A sharp bright point of the width equal to ... A bright ring at the centre surrounded by alternate dark and bright rings D. A diffused bright point

Last Answer : C. A bright ring at the centre surrounded by alternate dark and bright rings

Description : You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables ... than the others. You are asked to both identify it and determine whether it is heavy or light -Riddles

Last Answer : Most people seem to think that the thing to do is weight six coins against six coins, but if you think about it, this would yield you no information concerning the whereabouts of the only different coin. ... . The heavier one is the different coin. If they balance, then 2 is a different light coin.

Description : When light falls on rod cells (A) All-cis-retinal is converted into all-trans-retinal (B) 11-cis-retinal is converted into 11-trans-retinal (C) 11-trans-retinal is converted into all-transretinal (D) 11-cis-retinal is converted into all-trans-retinal

Last Answer : Answer : D

Description : The following methods can be used to test solely the rod ERG: a. a rapidly flickering light b. red light stimulus c. low-density blue light in dark adapted eye d. focal ERG

Last Answer : low-density blue light in dark adapted eye

Description : Assume that a program will experience 200 failures in infinite time. It has now experienced 100 failures. The initial failure intensity was 20 failures/CPU hr. Then the current failure intensity will be (A) 5 failures/CPU hr (B) 10 failures/CPU hr. (C) 20 failures/CPU hr. (D) 40 failures/CPU hr.

Last Answer : (B) 10 failures/CPU hr.

Description : Decision to stop testing should be based upon A. Successful use of specific test case design methodologies B. A percentage of coverage for each coverage category C. Rate of error detection falls below a specified threshold D. All of the above

Last Answer : D. All of the above

Description : The threshold effect in demodulators is a) The rapid fall of output SNR when the input SNR falls below a particular value b) Exhibited by all the demodulators when the input SNR is low c) Exhibited by all AM suppressed carrier coherent demodulators d) Exhibited by correlation receivers

Last Answer : The threshold effect in demodulators is The rapid fall of output SNR when the input SNR falls below a particular value

Description : The minimum energy required to eject an electron from a metal surface is called a) Intensity b) Threshold frequency c) Work function d) Photo energy

Last Answer : c) Work function

Description : In man sedation caused by morphine is characterized by (a) Initial excitement (b) Little or no motor incoordination (c) Rise in seizure threshold (d) All of the above

Last Answer : Ans: B

Description : In man sedation caused by morphine is characterised by: A. Little or no motor incoordination B. Initial excitement C. Rise in seizure threshold D. All of the abov

Last Answer : A. Little or no motor incoordination

Description : Pick up the correct statement from the following: (A) The intensity of rain is the rate at which it falls (B) The duration of rain is the time for which it falls with a given intensity (C) The frequency of rain is the number of times, if falls (D) All the above

Last Answer : Answer: Option D

Description : Which of the following statement(s) is/are true concerning the pulmonary response to shock? a. The acute pulmonary vascular response to shock differs markedly from that of systemic vasculature b. The ... elements e. A decrease in lung compliance may result from the loss of type I pneumocytes

Last Answer : Answer: c, d, e Contributing pathophysiologic processes to the pulmonary manifestations of shock include the pulmonary component of the cardiovascular response, disruption of the normal ... injury from mediators of inflammation elaborated elsewhere, and from activated cellular blood elements

Description : What is dark adaptation?

Last Answer : Dark adaptation is the process by which the human eye adjusts to low levels of illumination, involving changes in the sensitivity and function of the photoreceptor cells in the retina.

Description : Help! Legit resources for dark adaptation, aka night vision, in humans.

Last Answer : I am not sure exactly what your question is asking, so you mean like the pupils dilating?

Description : An early effect of vitamin a deficiency is (A) Xerophthalmia (B) Keratomalacia (C) Prolonged dark adaptation time (D) Follicular hyperkeratosis

Last Answer : Answer : C

Description : True statements about EOG (electro-oculogram) include: a. the EOG light-peak to dark-trough ratio is reduced in central retinal vein occlusion b. the light peak of EOG is abnormal in Best' ... rise is produced by depolarization of the basal membrane of the retinal pigment epithelium d. all above

Last Answer : all above

Description : The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

Last Answer : can be used to assess the overall retinal integrity in the presence of media opacity

Description : At therapeutic doses, actions of amphetamine include the following except: A. Prolongation of attention span B. Wakefulness C. Lowering of seizure threshold D. Delaying fatigue

Last Answer : C. Lowering of seizure threshold

Description : At therapeutic doses, actions of amphetamine include the following except: A. Prolongation of attention span B. Wakefulness C. Lowering of seizure threshold D. Delaying fatigue

Last Answer : C. Lowering of seizure threshold

Description : At therapeutic doses, actions of amphetamine include the following except: A. Prolongation of attention span B. Wakefulness C. Lowering of seizure threshold D. Delaying fatigue

Last Answer : C. Lowering of seizure threshold

Description : The connecting rod bolts are tightened up so that the initial tightening stress (A) Approaches yield point (B) Approaches endurance limit (C) Approaches (yield point stress/factor of safety) (D) Approaches (endurance limit stress/factor of safety)

Last Answer : (A) Approaches yield point

Description : The connecting rod bolts are tightened up with the initial tension greater than external load so that (A) Failure of bolt will be static (B) The resultant load on bolt will not be affected by ... ) The bolt will not fail by fatigue although the external load is fluctuating (D) All the three

Last Answer : (D) All the three

Last Answer : The initial permeability of an iron rod is the permeability almost in non-magnetised state.

Description : Pick up the correct statement from the following: (A) The minimum frequency of light for which no electrons are emitted, is called threshold frequency (B) Polarising angle of glass is 57.5° (C) At the polarising angle, the reflected and refracted rays are orthogonal (D) All the above

Last Answer : Answer: Option D

Description : The producer usually is most concerned about the a). Competitive threshold b). Economic threshold c). Both a and b d). None of the above

Last Answer : b). Economic threshold

Description : The following are true about the sensitivity of the visual system: a. in the dark the peak sensitivity of the eye is around 500nm b. in the light the peak sensitivity of the eye is around 555nm c ... Hz and above d. a dark-adapted eye is more sensitive to blue-green light than a light-adapted ey

Last Answer : a dark-adapted eye is more sensitive to blue-green light than a light-adapted ey

Description : Following statement is true about lidocaine (a) Reduce the slope of Phase 4 (b) Threshold excitability is not altered (c) Action potential is not affected (d) All of the above

Last Answer : Ans: A

Description : In reference with antireflection coating which of the following statement is true? A. Thickness of the film should be changed for light of same wavelength but different intensity B. Thickness of ... D. Thickness of the film should be decreased for light of same wavelength but higher intensity

Last Answer : B. Thickness of the film need not be changed for light of same wavelength but different intensity

Description : Which of the following statements is true with regard to the relationship among audit risk, audit evidence, and materiality? a. The lower the inherent risk and control risk, the lower ... inherent risk. d. Aggregate materiality thresholds should not change under conditions of changing risk levels

Last Answer : Under conditions of high inherent and control risk, the auditor should place more emphasis on obtaining external evidence and should reduce reliance on internal evidence

Description : Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm. (A) 3-5 (B) 25-30 (C) 60-65 (D) 95-100

Last Answer : (B) 25-30

Description : The following statement(s) is/are true concerning HIV infection. a. Initial screening with ELISA is highly sensitive but can be associated with a false positive rate of 25% b. ... , carinii pneumonia, CMV pneumonitis, Cryptococcus meningitis, and disseminated infection due to atypical mycobacteria

Last Answer : Answer: b, c, d Acquired immunodeficiency syndrome (AIDS) is a syndrome caused by the human retrovirus (HIV-1) that infects T lymphocytes and causes severe immunosuppression. Individuals who ... to prolong survival when administered early in the course of disease and is considered routine therapy

Description : The following statement(s) is/are true concerning initial microbiologic diagnostic techniques. a. Appropriate expeditious transport of specimens to the microbiology laboratory is essential for obtaining accurate ... a 4-to 8-fold increase over the MIC to be considered clinically efficacious.

Last Answer : Answer: a, c, d Because most surgical infections are polymicrobial, specimens should be cultured for aerobic and anaerobic bacteria, as well as fungi. Although aerobic and aerotolerant ... fold increase over MIC during the peak serum level have been demonstrated to be clinically efficacious

Description : Which of the following statement(s) is/are true concerning the antibody response to an invading antigen? a. All antibodies are composed of one type of heavy and one type of light protein chain b. ... stimulus d. Immunoglobulins A, D, and E play an active role in the circulating humoral response

Last Answer : Answer: a Humoral defenses consist of antibody (immunoglobulin; Ig) and complement. All Ig classes (IgM, IgG, IgA, IgE, IgD) and IgG subclasses are composed of one type (M, G, A, E, D ... exist in smaller amounts in the circulation and do not appear to play a major role as host defense components

Description : What do you think of a hand gun that folds up to resemble a cell phone?

Last Answer : White people get shot for having phones too?

Description : Why would a dog have one ear that stands up straight and one that folds over?

Last Answer : This happens with German Shepherds and I imagine the reasons are the same. Many breeds of dogs that ultimately begin with standing up ears, often start as floppy ears and then start to stand up as the dog ... way while it is learning to stand up, the result is an ear that either folds or flops.

Description : What are some good modern rock pianists? Like Ben Folds. Looking for a piano HSC song?

Last Answer : Five Iron Frenzy Dispatch Guster None of these are as good as Ben Folds, but still pretty good.

Description : How do you create creases(raised folds) and wiskering on jeans without comercial machinery?

Last Answer : if link doesn’t work google search crinkle machine youtube

Description : A thousand colored folds stretch toward the sky, Atop a tender strand, Rising from the land, 'Til killed by maiden's hand, Perhaps a token of love, perhaps to say goodbye. What am I? -Riddles

Last Answer : A flower.

Description : what- a child folds a rectangular strip of paper repeatedly along the dashed lines, as shown. The first triangle is labeled?

Last Answer : FHG is isosceles but not necessarily equilateral

Description : what is the fleshy folds of tissue in the larynx?

Last Answer : higuvyitvyujvyfvyj

Description : How many folds is the lungs covered by ?

Last Answer : The lungs are covered by a membrane with two folds.

Description : The longitudinal muscular folds of inner wall of stomach are called `:`

Last Answer : The longitudinal muscular folds of inner wall of stomach are called `:` A. Papilla of vater B. Rugae C. Villi D. Fissure

Description : What are three types of major folds?

Last Answer : Anticline, Syncline, Monocline.