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Questions and Answers
What is the primary function of the gizzard in the alimentary canal of a cockroach?
Which structure in the cockroach's alimentary canal is responsible for food storage?
At what location are the Malpighian tubules found in the cockroach's digestive system?
What distinguishes the hindgut from the midgut in a cockroach?
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What is the main component of haemolymph in a cockroach?
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How does blood enter the heart of a cockroach?
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What is the role of the tracheal system in a cockroach?
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What characterizes the blood vascular system of a cockroach?
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Which part of the heart in a cockroach is responsible for the pumping action?
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Where are the hepatic caeca located in the alimentary canal of a cockroach?
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Study Notes
Alimentary Canal
- The alimentary canal of a cockroach is divided into three regions: the foregut, midgut, and hindgut.
- The mouth opens into a short tubular pharynx, which leads to the esophagus.
- The esophagus opens into a crop for food storage.
- The crop is followed by the gizzard (or proventriculus), which has an outer layer of thick circular muscles and a thick inner cuticle with six chitinous plates (teeth).
- The gizzard helps grind food particles.
- The entire foregut is lined with cuticle.
- A ring of 6-8 blind tubules (hepatic or gastric caeca) is present at the junction of the foregut and midgut, secreting digestive juices.
- At the junction of the midgut and hindgut there is a ring of 100-150 yellow, thin, filamentous Malpighian tubules, which remove excretory products from the haemolymph.
- The hindgut is wider than the midgut and is differentiated into the ileum, colon, and rectum; the rectum opening to the exterior via the anus.
Circulatory System
- The blood vascular system is an open type.
- Blood vessels are poorly developed and open into a space called the haemocoel.
- Visceral organs within the haemocoel are bathed in blood (haemolymph).
- The haemolymph consists of colourless plasma and haemocytes.
- The heart is an elongated muscular tube along the mid-dorsal line of the thorax and abdomen.
- The heart is differentiated into funnel-shaped chambers with ostia (openings) on either side.
- Blood from the sinuses enters the heart via the ostia, and is pumped anteriorly to the sinuses.
Respiratory System
- The respiratory system consists of a network of trachea that open through 10 pairs of spiracles on the lateral side of the body.
- Thin branching tubes (tracheal tubes subdivided into tracheoles) carry oxygen from the air to all parts of the body.
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Description
Explore the fascinating structure of the cockroach's alimentary and circulatory systems. This quiz covers the anatomy of the foregut, midgut, and hindgut, as well as the circulatory components that support these functions. Test your understanding of how these systems work together in this unique insect.
