Class Holothuroidea (Sea Cucumbers) Flashcards

Questions and Answers

What are tentacles in sea cucumbers?

Organs for gas exchange

Structures for reproduction

Modified tube feet near the mouth for locomotion

Modified tube feet near the mouth used to capture suspended food particles from surrounding water (correct)

What is the function of the pharynx in sea cucumbers?

Transports food from mouth to stomach.

Describe the stomach's characteristics in sea cucumbers.

Extremely reduced; site of food storage and initiation of digestion.

What is the role of the intestine in sea cucumbers?

Final digestion of food received from stomach and subsequent nutrient absorption. Signup and view all the answers

What does the cloaca do in sea cucumbers?

Pumps a ventilating current of seawater into and out of the respiratory trees. Signup and view all the answers

What is the function of the anus in sea cucumbers?

Regulates egestion of undigested food (feces) from the body. Signup and view all the answers

What are tube feet used for in sea cucumbers?

Locomotion. Signup and view all the answers

What is the purpose of gonads in sea cucumbers?

Produces gametes for reproduction. Signup and view all the answers

What is the function of respiratory trees in sea cucumbers?

Gas exchange. Signup and view all the answers

Study Notes

Anatomy and Functions of Holothuroidea (Sea Cucumbers)

Tentacles: Modified tube feet around the mouth; adapted for capturing food particles from the water.
Pharynx: Connects the mouth to the stomach; essential for transporting food during digestion.
Stomach: Highly reduced organ; functions in food storage and initial digestion.
Intestine: Site for final digestion and nutrient absorption after food passes from the stomach.
Cloaca: Serves multiple functions including excretion and reproduction; facilitates the movement of seawater in and out of the respiratory trees for ventilation.
Anus: Plays a key role in egestion; regulates the expulsion of undigested food (feces).
Tube Feet: Sparse distribution along the body; organized in five longitudinal rows; primarily used for locomotion.
Gonad: Responsible for gamete production; plays a crucial role in the reproductive process of sea cucumbers.
Respiratory Trees: Specialized structures for gas exchange; essential for respiration and maintaining oxygen levels in body fluids.

Description

Test your knowledge of Holothuroidea with these flashcards. Each card features a term related to sea cucumbers, alongside its definition to enhance your understanding. Perfect for students and enthusiasts alike!