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AU / Biology / BIOL 1010 / Define homeostasis.

Define homeostasis.

Define homeostasis.

Description

School: Auburn University
Department: Biology
Course: A SURVEY OF LIFE
Professor: Kearley
Term: Spring 2016
Tags: Science, Biology 1010, and survey of life
Cost: 25
Name: Biology 1010, Survey of life
Description: Week one of notes covering: skin, skin cancers, and bones/cartilage
Uploaded: 01/24/2016
2 Pages 54 Views 2 Unlocks
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Biology 1010, lecture 1.  


Define homeostasis.



*homeostasis: Stable internal operating conditions within the body (ex. temperature, blood etc.)  

I. Integument: protective outer covering of the body  

A. Functions  

1. Protect from Abrasions, bacterial attack, ultraviolet radiation & dehydration (first line of defense)  2. Helps control internal temperature  

3. sensory receptors detect environmental stimuli  

B. Structure of Skin  

1. Epiderpmis  

a) Composed of several layers of cells  

(1) living cells reproduce/divide and when they die, they're pushed to the surface  

b) Stratum Basale: innermost layer, cells that undergo mitosis.  

*contains melanocytes which darken skin and protect against UV rays  

c) Stratum Corneum: outermost layer, made of dead skin cells (keratin)


It is the protective outer covering of the body. what is it?



*protects cells inside  

2. Dermis  

a) mostly connective tissue: collogen/elastin  Don't forget about the age old question of How did the atomic bomb affect society?

b) houses blood vessels, lymph vessels, oil/sweat glands and sensory nerves  

c) sweat clands, oil, hair and arrestor pili muscles  

(1) sweat glands: produce fluid in response to stress  

(2) oil glands lubricate and soften the skin and secretions that reduce bacterial population  3. Hair: root embedded in the dermis  

4. Arrector Pili: smooth muscles that are attached and erect hairs when you're scared or cold. (goose  bumps)

*hypertrichosis: excessive hair all over  

C. Skin Caner  

1. Most Common  

    *1/2 of cancers found  

a) basal cell carcinoma  


What is arrector pili?



b) squamous cell carcinoma  

c) Malignant Melanoma (most dangerous)  

2. Melanoma: 3/4 of deaths form skin cancer  

    **5 year survival rates  

      localized: 98% (site of origin)  

      regional: 62% (surrounding tissue)  

      distant: 15% (gone to the ret of the body)  

-wrinkles: collagen breaking down (sun or age)  

II. Muscoskeletal system  

A. Humans have an endoskeleton composed of bone and cartilage  

*resists compression, makes up nose, joins bones, and cushions them  

B. Cartilage  

1. Hyaline: tracheal rings, end of nose, end of sternum, and articulating joints  If you want to learn more check out Who is henry brackenridge?

2. elastic cartilage: exterior ear  If you want to learn more check out What is the biological medium on earth?
We also discuss several other topics like Who argues for civil disobedience in the face of unjust or immoral laws?
If you want to learn more check out Why do companies go into advertising their products?

3. fibrocart: interverbal disks (nerves)  

**cartilage takes longer to heal because there is less blood flow  

C. Bone

1. Functions  

a) interact w muscles to move body  

b) support and protect  

c) depository  

d) blood reproduction  

2. Structure  

a) compact bone: found on the outside of bone  

b) osteocyte (bone cells) : found in compact bone, housed inside lacunae  c) haversion system: found in compact bone, composed of concentric circles called lamellae  d) at center is aversion canal which contains blood vessels and nerves  If you want to learn more check out How does culture influence communication?

e) canaliculi: tiny channels connecting the aversion canals to the osteocyte  f) spongy bone found in epiphysis and contains marrow producing red blood cells

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