How can this PLR (pupillary light reflex) help you determine whether the lesion is in the eye itself or elsewhere?

Biology

1 answer:

Contact [7]2 years ago

4 0

Answer:

Pupillary light reflex refers to the contraction that the pupils present when they light up. In cases of injury to the optic nerve, when the eye where the injured optic nerve is illuminated, since it cannot conduct the stimulus to the brain, neither pupil closes.

Explanation:

Pupillary light reflex refers to the reaction that causes the pupil to close with light thanks to the contraction of the sphincter of the pupil and to open in the dark thanks to the relaxation of that muscle by not receiving any stimulus. A light stimulus reaches the eye and in the retina it is transformed, through a chemical reaction, into an electrical stimulus that will be transmitted through the optic nerve and the visual pathways to the brain. The visual cells of the retina, rods and cones, also act as light receptors that control the pupil's motor activity. Thus, pupil-motor thresholds to light follow the same spectral sensitivity deviations as visual thresholds, which are a function of the state of light adaptation of the retina.

You might be interested in

Isolating all of the RNA out of an organism, subjecting it to reverse transcriptase, and then cloning all of the resulting DNA i

Lisa [10]

Answer:

The answer is C.

Explanation:

The example process given in the question is describing the creating of a cDNA Library. cDNA or Complimentary DNA is copy of the DNA that is taken from a messenger RNA (mRNA), which is what is done with the reverse transcriptase. And the process described as cloning the resulting DNA into plasmids is the part where the library is created. The resulting DNA is put into host organisms and stored there for further investigation or use.

I hope this answer helps.

4 0

3 years ago

10. Which of the following is an example of a prevention activity? A. Mobilizing search and rescue teams B. Requiring identifica

Step2247 [10]

Answer:

Option (B).

Explanation:

Fundamentals of Emergency Management (FEMA) may be defined as the organization that helps in the management of resources. This also helps to deal with the all humanitarian emergency.

Prevention activities to remove the particular danger are also listed in the FEMA. The identification for the site access previously might helps to reduce the health related and risk related problems of the individuals working at the site.

Thus, the correct answer is option (B).

5 0

3 years ago

Adding and removing energy can change the physical properties of a substance.

postnew [5]

Answer: True.

Explanation: Energy is being removed from the substance as it changes state. As energy is added to the liquid, particles throughout the liquid move faster. Boiling. When particles move fast enough to break away from other particles, they evaporate and become gas.

3 0

3 years ago

Bacteria live in a variety of locations one of which is the human mouth. Which explanation supports the wide variety of bacteria

podryga [215]

The answer is C. <span> Accessibility to nutrients makes the mouth a favorable habitat.

Hope this helped. Good luck!</span>

6 0

3 years ago

Read 2 more answers

Can you recognize the eight stages of meiosis based on the location and behavior of the chromosomes? drag the diagrams of the st

Paul [167]

In meiosis, cell division will occur two times. It shall be called Meiosis I and Meiosis II. And Meiosis happens to our sex cells, egg for female and sperm cells for the male. There four stages in Meiosis I, Prophase I will happen when who homologous chromosomes exchange DNA. Metaphase I will happen when the pair move together in the center. Anaphase I is when the who homologous chromosomes are pulled apart to opposite poles. Telophase I is when the the first division of the chromosomes happen. Producing two 24 chromosomes cells. The nest division will produce haploid or 12 chromosome cells. In Propase II, the nuclear walls will disappear once again, in the Metaphase II the cells will meet again in the center. In Anaphase II the chromatids will be pulled apart. And then lastly in the Telophase II, the chromatids will not be 2 haploids. So in Meiosis, 4 sex cells are produced.

4 0

3 years ago