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Questions and Answers
Which component of the alimentary canal is primarily responsible for food storage?
What is the main function of the Malpighian tubules in a cockroach?
Which part of the heart in a cockroach collects blood from the surrounding sinuses?
What structures are located at the junction of the foregut and midgut?
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What is the primary function of the gizzard in the cockroach's digestive system?
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How many pairs of respiratory pores do cockroaches have for their tracheal system?
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Which part of the hindgut opens to the anus in cockroaches?
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What is the composition of haemolymph in cockroaches?
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Which organ is responsible for secreting saliva in cockroaches?
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What distinguishes the midgut from the hindgut in cockroach anatomy?
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Study Notes
Alimentary Canal
- The alimentary canal in a cockroach is divided into three sections: the foregut, the midgut, and the hindgut.
- The foregut consists of the mouth, pharynx, esophagus, crop, gizzard, and hepatic caecae.
- The crop is a sac-like structure that stores food.
- The gizzard has thick circular muscles and chitinous plates (teeth) that grind food.
- The hepatic caecae are blind tubules that secrete digestive juices.
- The midgut is the junction between the foregut and hindgut.
- The hindgut is wider than the midgut and includes the ileum, colon, and rectum.
- The rectum opens to the anus.
Accessory Organs
- Salivary glands secrete saliva, which is involved in digestion.
- The salivary reservoir stores saliva.
Blood Vascular System
- The cockroach has an open blood vascular system.
- Blood vessels are poorly developed and open into a space called the hemocoel.
- Visceral organs are bathed in blood (hemolymph).
Haemolymph
- Hemolymph is composed of colorless plasma and hemocytes.
Heart
- The heart is an elongated muscular tube located along the mid-dorsal line of the thorax and abdomen.
- It has funnel-shaped chambers with ostia (openings) on both sides.
- Blood from sinuses is pumped into the heart through the ostia, moving forward to other sinuses.
Respiratory System
- The respiratory system consists of a network of trachea that open through 10 pairs of pores.
Excretory System
- The excretory system is composed of 100-150 thin filamentous Malpighian tubules.
- These tubules are located at the junction of the midgut and hindgut.
- They remove excretory products from the hemolymph.
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Description
Explore the anatomy of the cockroach, focusing on the alimentary canal and blood vascular system. Learn about the different sections of the alimentary canal, accessory organs, and the unique aspects of the cockroach's open blood vascular system. This quiz will enhance your understanding of cockroach physiology.
