The epidermis is primarily considered: SELECT ANY ANSWERS THAT ARE ACCURATE. Que

Question

The epidermis is primarily considered:

SELECT ANY ANSWERS THAT ARE ACCURATE.

Question 1 options:

Simple Columnar epithelium

Stratified cuboidal epithelium

Areolar Connective tissue

Cartilage

Dense Connective Tissue

Stratified squamous epithelium

Answer not listed

Simple squamous epithelium

Insufficient information given to answer

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Question 2 (1 point)

The ______ is a layer of the EPIDERMIS that is considered 'vascularized.'

SELECT ANY ANSWERS THAT ARE ACCURATE.

Question 2 options:

Stratum Spinosum

Stratum Corneum

Answer not listed

Reticular layer

Papillary Layer

Stratum Basale

Stratum Granulosum

Stratum Lucidum

Insufficient information given to answer

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Question 3 (1 point)

According to the DSM-IV (American Psychiatric Association “Diagnostic and Statistical Manual of Mental Disorders), approximately 9% of the US population suffers from a specific phobia. Arachnophobia is a condition characterized by fear of spiders. Small insects can crawl on the skin and activate cutaneous receptors that are specialized for the reception of touch and light pressure. Which receptors, if activated, might promote the idea of a spider crawling on your arm?

SELECT ONE ANSWER.

Question 3 options:

Pacinian corpuscle(s)

Free Nerve Endings

Meissner's Corpuscles

Krause's end bulbs

Simple Columnar epithelium

Stratified cuboidal epithelium

Areolar Connective tissue

Cartilage

Dense Connective Tissue

Stratified squamous epithelium

Answer not listed

Simple squamous epithelium

Insufficient information given to answer

Explanation / Answer

1)The epidermis is also callef stratified squamoue epithelium because, the outermost part of the epidermis is composed of stratified layers of flattened cells that overlies a basal layer (stratum basale) composed of columnar cells arranged perpendicularly.The stratified squamous epithelium is maintained by cell division within the stratum basale. Differentiating cell delaminate from the basement membrane and are displaced outwards through the epidermal layers, undergoing multiple stages of differentiation until, in the stratum corneum, losing their nucleus and fusing to squamous sheets, which are eventually shed from the surface (desquamation). Differentiated keratinocytes secrete keratin proteins which contribute to the formation of an extracellular matrix and is an integral part of the skin barrier function.

2)Stratun Basale is the most vascularised layer of the epidermis because The stratum basale is a continuous layer of cells.is primarily made up of basal keratinocyte stem cells, which can be considered the stem cells of the epidermis. They divide to form the keratinocytes of thestratum spinosum, which migrate superficially.Other types of cells found within the stratum basale are melanocytes(pigment-producing cells), Langerhans cells(immune cells), and Merkel cells (touch receptors). Since these are migratory cells, the former argument is justified.

3)Meissner'scorpuscles are a type of mechanoreceptor that will be activated at the instance a spider crawling over the arm because, they are a type of nerve ending in the skin that is responsible for sensitivity to light touch. In particular, they have highest sensitivity when sensing vibrations between 10 and 50 Hertz.They are most concentrated in thick hairless skin, especially at the finger pads and arm.

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