Write the structure and function of the gizzard of cockroaches.

Hint: The gizzard is a kind of muscular stomach in cockroaches. It includes sharp teeth which are able to grind the food into small parts. The alimentary canal is a tubular arrangement, expanding from the mouth to the anus found in the body nook of cockroach. It is divided into three main regions: foregut, midgut and hindgut.

Complete answer:
Digestion Process
Digestion in cockroach begins first at the mouth where the parts like mandibles as well as maxillae help to chew the food. The part named salivary carbohydrates digests food to a partial extent. The saliva juice lubricates the food and abets to swallow it. Later the food moves to the esophagus and then onto the crop. At This point the food in its masticated form is stored temporarily.

The next point is where the food moves forward to be at the gizzard where it’s grinding takes place. There is a valve named stomodea right at the joint of the stomach and gizzard in cockroaches

The Alimentary canal in the gizzard of cockroach has been divided into three main parts:
Foregut
The alimentary canal in gizzard starts with the foregut which comprises the mouth and surrounded parts of the mouth. The cavity of the mouth is called the pharynx. The foregut extends in the form of the oesophagus that has a thin and narrow wall structure.

Midgut
Midgut creates real gut viz. Mesenteron as well as comprises the whole stomach or ventriculus. Six pairs of gastric are related to the stomach that causes cancer right at the joint of the gizzard and stomach.

Hindgut
This guy is a coil-like structure and includes the anterior ileum, middle colon, as well as posterior rectum. The final one viz, The posterior rectum has its opening to the exterior via the anus. It has a lining formed by the cuticle. There are plenty of long tubules also called Malpighian tubules right at the joint of the stomach as well as the ileum.



Note: Cockroach is omnivorous. It can eat all kinds of organic matter. The nutrition in cockroaches is known as holozoic. The Gizzard present in the cockroaches digestive system is for grinding of food materials.