The reason that the lack of digestive system in tapeworms indicates that it is the primitive, ancestral form of Platyhelminthes or not. Introduction: Platyhelminthes such as flatworms are the primitive organisms. They do not contain true organs, but they have primitive organ systems for digestion and excretion. Tapeworms do not contain digestive system because they depend on the host’s digestive system. However, free living flatworms contain a hole in the body in exchange.

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Answer 1

Question

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 33, Problem 4S

Summary Introduction

To explain:

The reason that the lack of digestive system in tapeworms indicates that it is the primitive, ancestral form of Platyhelminthes or not.

Introduction:

Platyhelminthes such as flatworms are the primitive organisms. They do not contain true organs, but they have primitive organ systems for digestion and excretion. Tapeworms do not contain digestive system because they depend on the host’s digestive system. However, free living flatworms contain a hole in the body in exchange.

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Compare the whole specimens and cross-sections of Ascaris and Dugesia. How would you differentiate these worms? Also, nematodes have a complete gut whereas most platyhelminths have an incomplete one. Think of one advantage of having a complete gut.

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The phylum Platyhelminthes has what type of symmetry?

Answer 2

Question

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 33, Problem 4S

Summary Introduction

To explain:

The reason that the lack of digestive system in tapeworms indicates that it is the primitive, ancestral form of Platyhelminthes or not.

Introduction:

Platyhelminthes such as flatworms are the primitive organisms. They do not contain true organs, but they have primitive organ systems for digestion and excretion. Tapeworms do not contain digestive system because they depend on the host’s digestive system. However, free living flatworms contain a hole in the body in exchange.

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Answer 3

Question

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 33, Problem 4S

Summary Introduction

To explain:

The reason that the lack of digestive system in tapeworms indicates that it is the primitive, ancestral form of Platyhelminthes or not.

Introduction:

Platyhelminthes such as flatworms are the primitive organisms. They do not contain true organs, but they have primitive organ systems for digestion and excretion. Tapeworms do not contain digestive system because they depend on the host’s digestive system. However, free living flatworms contain a hole in the body in exchange.

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Answer 4

Question

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 33, Problem 4S

Summary Introduction