Podcast
Questions and Answers
What are the two main regions of the frog's skin?
What are the two main regions of the frog's skin?
- Ectoderm and moulting
- Malpighian layer and peritoneum
- Epidermis and dermis (correct)
- Stratum germinativum and stratum corneum
From which embryonic layer is the epidermis of the frog's skin formed?
From which embryonic layer is the epidermis of the frog's skin formed?
- Peritoneum
- Ectoderm (correct)
- Endoderm
- Mesoderm
What is the name of the innermost layer of the frog's epidermis?
What is the name of the innermost layer of the frog's epidermis?
- Stratum corneum
- Dermis
- Peritoneum
- Malpighian layer (correct)
What happens to the cells in the Malpighian layer of the frog's skin?
What happens to the cells in the Malpighian layer of the frog's skin?
What is the outermost dead layer of the frog's skin called?
What is the outermost dead layer of the frog's skin called?
Describe the composition of the frog's body wall.
Describe the composition of the frog's body wall.
What are the two main regions of the frog's skin?
What are the two main regions of the frog's skin?
What is the function of the Malpighian layer in the frog's skin?
What is the function of the Malpighian layer in the frog's skin?
How is the dermis of the frog's skin described?
How is the dermis of the frog's skin described?
What happens to the outermost dead layer of the frog's skin?
What happens to the outermost dead layer of the frog's skin?
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Study Notes
Frog Body Wall Structure
- The body wall of frogs serves to cover and protect the organism.
- Composed of three layers: skin, underlying muscles, and peritoneum.
Skin Composition
- Skin consists of two primary regions: epidermis (outer layer) and dermis (inner layer).
Epidermis
- The epidermis is a stratified epithelium featuring multiple cell layers.
- Derived from the ectoderm layer of the embryonic development.
- Innermost layer known as the Malpighian layer (or stratum Malpighii/stratum germinativum).
- Cells in the Malpighian layer are tall, columnar, and constantly divide via mitosis to generate new cells.
- Newly formed cells migrate upward, where they become flattened and eventually keratinized.
- Surface cells are dead, extremely flat, and comprise the stratum corneum.
- The outermost layer (stratum corneum) is shed periodically through a process known as moulting.
Dermis
- The dermis is a resilient, vascularized layer that provides strength and flexibility to the skin.
- Dermal composition supports the overall structure of the skin and aids in protection.
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