Uric acid is the end product of purine metabolism.

Glucagon is a catabolic hormone as it converts glycogen to glucose.

Feeling colour rings around a flame is a symptom of glaucoma.

Brunner's gland. : any of the compound racemose glands in the submucous layer of the duodenum that secrete alkaline mucus and a potent proteolytic enzyme—called also duodenal gland.

 Hypocalcaemia occurs due to the shortage of calcium.

  Blood of Cockroach does not contain respiratory pigment.

Oxygenation of blood occurs in lungs

 The largest part of a diet is made up of carbohydrates.

The small intestine is all about maximising the surface area.

Myoglobin is an iron- and oxygen-binding protein found in the muscle tissue of vertebrates in general and in almost all mammals. It is related to hemoglobin, which is the iron- and oxygen-binding protein in blood, specifically in the red blood cells.

 Book-lungs are the respiratory organs of a scorpion.Each of these organs is found inside an open ventral abdominal, air-filled cavity (atrium) and connects with the surroundings through a small opening for the purpose of respiration.

Frogs use their skin to soak in the oxygen their bodies require. When they hibernate, they utilize the skin for any and all breathing. Damp skin is a must for subcutaneous gas exchange. If a frog's skin becomes dry, it will no longer be able to take in oxygen.

 Sinus venosus is a characteristic of fishes, amphibians and reptiles.

The vascular system of frog is well-developed closed type. Frogs have a lymphatic system also. The blood vascular system involves heart, blood vessels and blood.

 Fishes do not have ear ossicles.

Aponeuroses are layers of flat broad tendons. 

  It is found in dentine of teeth, in liver and in bones.

The middleman between blood and tissues is lymph.

Bony fishes are ammonotelic.

Oxytocin is a neurohormone secreted by hypothalamus.