Locust

Biology: Practical
Sonal Khirwadkar
De Lisle School
Investigating the effect of gas changes on Locust breathing
Part 1
Aim:
To design a fitted experiment to investigate the effect of changes in the composition of outside(a) personal credit line on the
locusts breathing. Adult locusts, cylinders of oxygen and carbon dioxide will be provided for the investigation
as well as all routinely available laboratory equipment.
Background selective information:
Insects do not have respiratory organs and do not use a circulatory ashes to commit oxygen around the
body. Instead they have a system of tracheal tubes which branch into tracheoles and these argon positioned
deep in the respiring tissues. The tracheal tubes are lined with a cuticle preventing loss of air by
diffusion, whereas the tracheoles are not. Air passes through spiracles directly into the tracheal tubes and
then(prenominal) the oxygen diffuses by concentration gradient from the tracheoles into the respiring tissues. The
spiracles are unemotional by valves or hairs to prevent excessive evaporation through them. The tracheal tubes
also have rings of chitin surrounding it so keeping the tube open when the abdomen contracts. (Similar to the
rings of cartilage around the human trachea.



) The abdominal movements can be counted to conk out a
measurement of the breathing rate of the locust.
In the example of the locust there are three thoracic spiracles located downstairs the thorax and there are seven
abdominal spiracles, six of which are located on the abdomen, the other on the thorax.
During ventilation when the insect is at rest air is drawn through spiracles 1,2 and 4. When these closedown air is
expired through spiracle number 10. When the insect is active, result occurs through spiracles 5-10. The
ventilation movements are synchronised with the opening and block of the spiracles.
Carbon dioxide is removed from the insect mainly by diffusion into the circulatory system and then diffusing
out through the chitin exoskeleton. Some...If you fatality to get a full essay, order it on our website: Ordercustompaper.com



If you want to get a full essay, wisit our page: write my paper