ANAT 261 Lecture Notes - Aldehyde, Haematopoiesis, Holocrine

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ceruleanprairie-dog589

6 Apr 2012

School

McGill University

Department

Anatomy & Cell Biology

Course

ANAT 261

Professor

Craig Mandato

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Document Summary

The skin is made of 3 layers: the epidermis (packed cells), the dermis (fibers) and the hypodermis (fat cells and reticular fiber). Protection: blocks entry of foreign material and also resist penetration and abrasion. Thermoregulation: controls the transfer of heat across the body"s surface, i. e. it regulates the body temperature through sweat, vasodilation, etc. Sensory abilities: receptors for pains, heat, etc. Communication: releases visual (e. g. blushing) and pheremonal signals. Appendages: hair, nails, sebaceous glands, sweat glands. The epidermis is made of a stratified squamous keratinized epithelium. We will discuss exactly what this means in a bit, but there are 4 main layers to the epidermis, going from the bottom up: Stratum germinativum (or stratum basili) is right on top of the basement membrane and is a single layer of columnar cells: these are the stem cells of the epithelium, and will differentiate into the layers above it.

Related Questions

1..Some ducts are formed by two layers of cells. In one duct, the apical cell (closest to the lumen, adluminal) are "taller than wide" and the basal cells (farther from lumen, abluminal) are "as tall as they are wide" Another way to describe this epithelium would be to state:

Simple columnar epithelium

Stratified squamous epithelium

Simple squamous epithelium

Simple transitional epithelium

Simple cuboidal epithelium

Stratified cuboidal epithelium

Stratified columnar epithelium

2..Acne (e.g. Acne vulgaris) accounts for approximately 10-15% of all dermatological appointments. This disease is commonly caused by bacterial overgrowth on secreted 'oil.' This disease is related to oil glands which are:(SELECT ANY STATEMENTS THAT ARE APPROPRIATE.)

exocrine glands

ceruminous glands

sebaceous glands

endocrine glands

sudoriferous glands

3. You see a patient complaining of coughing and they report a history of pneumonia. Reading the patientâs history further, you notice they have been diagnosed with cystic fibrosis. Essentially, their mucus is thick and very âstickyâ because they can not secrete adequate water with the mucus. Since many areas of the body produce sticky mucus, you expect _______ (epithelia) to be the primary tissue involved with the patientâs inability to absorb digested nutrients and secrete watery mucus.

Simple squamous

Stratified squamous

Simple columnar

Transitional

Simple cuboidal

Keratinocytes undergo significant changes in the:

stratum granulosum

stratum basale

stratum lucidum

stratum spinosum

Which statement is true?

cutaneous membranes contain dense irregular connective tissue