Questions and Answers
What does the brain of a crayfish do?
What system does a crayfish have? (Answer based on its characteristics)
Open circulatory system
What does the ventral nerve cord do?
Carries nerve impulses through the body from the brain
What is the function of the dorsal tubular heart in crayfish?
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What happens to food when it enters the mouth of a crayfish?
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Describe the stomach of a crayfish.
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What do digestive glands produce?
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Where does undigested food pass after the digestive glands/stomach?
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What do testes and gonads produce in crayfish?
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What is the function of green glands in crayfish?
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Study Notes
Internal Anatomy of Crayfish
- Crayfish possess a complex nervous system, an open circulatory system, and are carnivorous with a simple digestive setup.
Brain
- Acts as a mass of nerve ganglion, sending electrical pulses to control organs and muscles while gathering information.
Ventral Nerve Cord
- Responsible for carrying nerve impulses from the brain throughout the crayfish body.
Dorsal Tubular Heart
- Functions to pump blood via holes that maintain an open circulatory system, allowing blood to seep in and out.
Esophagus
- Serves as the passage for food that enters the mouth, directing it towards the stomach.
Stomach
- Comprises two chambers: one for storing food and one equipped with teeth for grinding and processing food.
Digestive Gland
- Located ventral to the heart and dorsal to the stomach, it produces enzymes post-stomach to facilitate chemical digestion.
Intestine
- Transports undigested food from the stomach and digestive glands to be eliminated through the anus.
Testes and Gonads
- Essential for reproductive processes, producing eggs or sperm for internal fertilization; situated ventral to the heart and digestive gland.
Green Glands
- Serve the excretory function by expelling waste through pores at the base of each antenna, located opposite the brain.
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Description
Explore the fascinating internal anatomy of crayfish through this informative quiz. Test your knowledge on the crayfish's complex nervous and circulatory systems, as well as key anatomical components like the brain and ventral nerve cord.
