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Questions and Answers
The foregut of a cockroach contains a gizzard that assists in grinding food particles.
True
The Malpighian tubules in a cockroach are found in the foregut region.
False
The blood vascular system of a cockroach is classified as a closed type.
False
The heart of a cockroach is a single chambered structure that pumps haemolymph throughout the body.
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The alimentary canal of a cockroach includes a structure known as the hepatic caeca.
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Cockroaches have 20 pairs of spiracles for gas exchange.
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Haemolymph in a cockroach is composed of colored plasma and cells known as haemocytes.
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The hindgut of a cockroach is narrower than the midgut.
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The esophagus in the alimentary canal leads directly to the gizzard.
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The tracheal system of a cockroach consists of branching tubes that transport oxygen directly to cells.
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Study Notes
Cockroach Alimentary Canal
- The alimentary canal is divided into three regions: the foregut, midgut, and hindgut.
- The mouth opens into a pharynx, leading to the esophagus, which connects to the crop (food storage).
- The gizzard, with chitinous plates, grinds food particles.
- The foregut is lined with cuticle.
- The junction of the foregut and midgut has hepatic caeca that secrete digestive juices.
- Malpighian tubules, at the junction of the midgut and hindgut, remove excretory products from the haemolymph.
- The hindgut is divided into the ileum, colon, and rectum, ending in the anus.
Open Circulatory System
- Cockroaches have an open circulatory system where blood (haemolymph) circulates freely within the body cavity (haemocoel).
- The haemolymph consists of plasma and haemocytes.
- The heart, a muscular tube, is located along the mid-dorsal line of the thorax and abdomen.
- It has chambers with ostia (openings) for blood entry.
- Blood enters the heart through the ostia and is pumped anteriorly back into the sinuses.
Respiratory System
- The respiratory system comprises a network of trachea, which open through spiracles (10 pairs) on the body's lateral sides.
- Tracheal tubes subdivide into tracheoles, delivering oxygen directly to body tissues.
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Description
Test your knowledge on the anatomy of the cockroach, focusing on its alimentary canal and open circulatory system. This quiz covers key components like the foregut, midgut, hindgut, and the unique aspects of its circulation. See how well you understand these fascinating biological systems!
