Question

After the single -pithed , the frog had response to withdraw response, rate of respiration when from 18 to 7 beat per min , ,surface tilting was slow, no corneal (eye touch) reflex,no response to noise, and it response to acetic acid.

1.What conclusions may be drawn regarding the varying levels of complexity of the abovereflexes based on the results you observed?

2.Answer the following questions about the single-pithed frog:a.How were the animal’s responses altered in the performed tests?

b.Explain why the responses were or were not altered following the pithing.

c. Indicate which of the previously performed reflexes did and did not require an intact brain?

Need Brain Brain not needed

Answer 1

1.In a single pithed frog, frog’s brain is destroyed, it has dead brain. But in that case spinal cord remain functional, so this kind of frog also known as spinal frog. So because of the dead brain thier responses level affected. During the spinal shock, causes overstimulation of neurons in the spinal cord.

The frog had response to withdraw response is a spinal response, this kind of response is used to protect itself from external stimuli or damage. The rate of respiration when from 18 to 7 beat per min ,it is controlled by the medulla through rate of expansion and constriction of the lungs. Tilting surface slowly is a Voluntary activity and posture. No corneal (eye touch) reflex, is a reflex action , it may be a result of respons to mechanical, chemical, and electrical stimuli.