Crowdly

Los múltiples problemas que plantea la asistencia al enfermo: eutanasia, aborto provocada, honorarios, certificados médicos, ensayos terapéuticos, etc. son resueltos conforme a las normas de conductas impuestas por:

El prestigio del médico

The large size of RFs in retinal ganglion cells at the periphery

Is useful in allowing better detection of light in daylight conditions

Allows better detection of wavelength-sensitivity differences

Is useful in allowing better detection of sources of low light levels

Allows better detection of flickering light

Allows better discrimination of colour

Cones are better at signalling a flickering stimulus because:

their response is slow and longer-lasting.

they respond only to axial light rays.

they respond only at night.

they are present only at the fovea.

their response is fast and is over quickly.

Retinal ganglion cells (RGCs) with OFF centre receptive fields (RFs):

are never inhibited by light anywhere across the retina.

are excited by light in the RF surround and inhibited by light in the RF centre.

are excited by input from cones and inhibited by input from rods.

are excited by light in the RF centre and in the RF surround.

are excited by light in the RF centre and inhibited by light in the RF surround.

The size of the receptive field of RGCs:

is greatest at the fovea where visual acuity is highest.

is smallest at the optic disk where there are few rod photoreceptors.

reflects the number of cyclic GMP molecules broken down by light.

reflects the amount of convergence from photoreceptors to RGCs.

is affected by the power of accommodation which, in turn, decreases with age.

Which of the following statements about vision in high levels of light is CORRECT?

It is determined by cones because they have different wavelength sensitivities.

It is determined by cones because they are concentrated at the fovea.

It is determined by rods because they have more photopigment molecules.

It is determined by rods because they have a more efficient light-activated cascade.

It is determined by cones because they have a less efficient light-activated cascade.

Francisco Flores declara que la mejor división para estudiar la Historia de la Medicina es a partir de la división de los tres estadios:

Anatómico, histórico y progreso

Libertad, orden y progreso.

Teológico, amor y orden

Filosófico, metafísico y positivo