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Questions and Answers
What is the primary function of the gizzard in the cockroach alimentary canal?
What is the primary function of the gizzard in the cockroach alimentary canal?
Which structures are primarily involved in excretion within the cockroach's midgut?
Which structures are primarily involved in excretion within the cockroach's midgut?
What is the role of the crop in the cockroach's alimentary canal?
What is the role of the crop in the cockroach's alimentary canal?
Which part of the cockroach alimentary canal is lined with digestive cells?
Which part of the cockroach alimentary canal is lined with digestive cells?
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What is the main function of the hepatic caeca in the cockroach?
What is the main function of the hepatic caeca in the cockroach?
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How does the circulatory system of a cockroach differ from a closed circulatory system?
How does the circulatory system of a cockroach differ from a closed circulatory system?
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Which structure connects the pharynx to the crop in a cockroach?
Which structure connects the pharynx to the crop in a cockroach?
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What is the primary function of the rectum in the hindgut of a cockroach?
What is the primary function of the rectum in the hindgut of a cockroach?
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Study Notes
Alimentary Canal of a Cockroach
- The digestive system of a cockroach is divided into the foregut, midgut, and hindgut.
- Foregut: The foregut begins with the mouth and leads to a tubular pharynx. The pharynx opens into an oesophagus which is a sac-like structure that stores food. The crop is followed by a gizzard, which grinds food using muscular walls. The foregut is lined with 6-8 blind tubules called gastric caecae, which secrete digestive juices.
- Midgut: The midgut is a junction between the foregut and hindgut. It contains about 100-150 Malpighian tubules, which are involved in excretion. The midgut is lined with digestive cells and hepatic caeca, which secrete digestive enzymes.
- Hindgut: It starts with the ileum and continues to the rectum, where waste products are collected and expelled through the anus.
- Crop: A sac-like structure connecting the esophagus to the gizzard used for food storage.
- Gizzard: A muscular structure responsible for the grinding of food.
- Mesenteron (or Midgut): Contains digestive cells (Hepatic caeca) that further break down food, surrounded by Malpighian tubules.
- Malpighian tubules: These tubules remove excretory products from the body.
- Colon: Part of the hindgut for further material processing.
- Ileum: Part of the hindgut.
- Rectum: Part of the hindgut to store and expel waste material.
- Oesophagus: Muscular tube connecting the pharynx to the crop.
Cockroach Circulation
- The circulatory system of the cockroach is an open system.
- Blood (haemolymph) is circulated in spaces surrounding the organs (visceral organs) and bathed in the haemolymph.
- The heart is a long, muscular tube located along the dorsal midline of the thorax and abdomen.
- Blood from sinuses flows into funnel-shaped chambers (ostia) and is pumped through the aorta to the rest of the body.
- The digestive system is crucial and has associated structures like the salivary gland, crop, and gizzard.
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Description
Explore the intricate digestive system of a cockroach in this quiz. Learn about the foregut, midgut, and hindgut, along with their specific functions and structures such as the crop and gizzard. Test your knowledge on the components and processes that facilitate digestion in this fascinating insect.
