Perpetual Help System Essay

1. What do you think is the function of the nictating tissue layer, and why ? The nictitating membrane is a protective, semi-transp atomic number 18nt third eyelid. It allows vision while giving the eye extra protection. In the case of frogs, the protection is needed when the frog is out of the urine system. The clear nictitating membrane allows the frog to keep looking for prey and looking out for herons and new(prenominal) hunters while its eyes are protected from dust and from the drying effects of the air. 2. A frog does not chew its food, what do the positions of its teeth suggest intimately how the frog uses them ? That they are intended for gripping, not for chewing. The 4 teeth a frog has, are positioned with 2 on the sides and 2 in the center, and are angled toward the throat. This helps keep the food going in the direction of the digestive tractbut unable to back out of the rima oris. 3. Trace the fashion of food through the digestive tract.In the frogs mouth there is a front hinged tongue. This flips food into the gullet, which is the entrance to the esophagus. The food is go worst into the stomach by muscle contraction. The stomach breaks food down mechanically using its multiple muscle layers. It excessively secretes enzymes to convert obscure nutrients into simpler ones. The enzymatic breakdown continues in the small intestine where the simpler nutrients are also then absorbed. The go forth over material is passed on to the declamatory intestine where water may be absorbed from the mixture. 4. Trace the channel of tune through the circulatory remains. The Deoxygenated blood flows from the body into the right atrium. Oxygenated blood from the lungs flows into the left atrium. Since frogs have only one ventricle, the oxygenated and deoxygenated blood mixes in the ventricle. From there, blood flows into the truncus arteriosus that contains a spiral valve to separate and lead the blood out into the body. 5. Trace the path of air th rough the respiratory system.Nostrils - Nasal Cavity - Pharynx - larynx - Trachea - Bronchi - Bronchioles - Lungs - Alveoli 6. Trace the path of sperm in a young-begetting(prenominal) and eggs in a female. Male Testes produce sperm, move through sperm ducts into the cloaca. Female Ovaries produce eggs, move through oviducts into uteri, then through the coaca. 7. Trace the path of urine in both sexes.Urine is organise in the distal tubules of the nephron in the kidneys. It accumulates in the renal pelvis, then travels down the ureters to the bladder. Then it goes through the urethra to the outside.8. Which part of the frogs sick system can be its abdominal cavity and hid legs? The Spincal cord and the muscualr system which mainly takes place in the thigh 9. Suppose in a living frog the spinal nerve extending to the leg muscle were cut. What world power would the frog lose? Why? In any vertebrates, all organize response movements and actions would be disabled from the point the n erve was injured and down. break up spinal damage will kill the animal. 10. The abdominal cavity of a frog at the end of hibernation season would contain very blue bodies or move at all. What is the function of the fat bodies? To pertain its cypher lose, from being lack to food.11. Structures of an animals body that jib it for its environment are adaptions. How do frogs powerful legs help it to fit into a life both in water and land? On land, the frogs hinder(prenominal) legs are what enables the frog to leap, and in the water, it uses its hind legs for swimming. Being able to leap quickly on land, and to swim clean a quickly is one of the frogs best defenses in avoiding predators. 12. During 1 mating of frogs, female lays whatever 2000 to 3000 eggs in water as the male sheds millions of sperm over them. How do these large numbers game relate to the frogs fitness for life in water? Frogs are very fit for life in water reproductively, because the large numbers of eggs and of fspring will help to ensure some individuals survive to reproductive adulthood.