Unit 8: Physiology
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Transcript of Unit 8: Physiology
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Unit 8: PhysiologyLeft Side Pg Right Side Pg
Unit Page 48 Table of Contents 49
Neuron/Synapse 50 C.N. – Control Systems 51
Homeostasis 52 Section 35-2 53
Flow Map: Blood Glucose 54 Flow Map: Leptin & Hunger
55
Tree Map: Body Maintenance Systems
56 C.N. Body Maintenance Systems
57
Word Bank: Control Systems
58 Word Bank: Maintenance Systems
59
Double Bubble 60 C.N. – Immune System 61
Word Bank – Immune system
62 Word Bank (Cont.) 63
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Immune System Part 1: Infectious Disease
Chapter 40-1 & 2
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Infectious Disease Disrupts normal body function
(homeostasis) Caused by a pathogen.
Pathogen: anything that invades your body & causes a disease
Ex: bacteria, protozoan, fungi, viruses, parasites, worms
It can be contagious = infectious
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Disease Transmission People may carry a disease without even
knowing it. Can be spread during the incubation period
(before symptoms occur) Transmission by:
1. Direct contact Kissing
2. Indirect contact-through the air coughing & sneezing
3. Contact with object sharing drinks, door knobs, desks
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4. Infected animals Vector transmits disease Ex: mosquito
5. Contaminated food or water food poisoning
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Agents of Disease Bacteria Viruses Protists
feed on nutrients in host’s blood ex: malaria, dysentery
Worms parasitic flatworms & round worms
ex: tapeworms & hook worms
See Next Sections
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Fungi most are harmless attack moist areas, like the skin,
scalp, mouth & throat ex: ringworms & athlete’s foot
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Bacteria Bacteria: prokaryote cells (no nucleus,
no membrane-bound organelles) Most bacteria are helpful or harmless A few are pathogens; they release toxins in
our bodies streptococcus (strep throat), staphylococcus
(staph infection) Most bacterial pathogens are fought by the
immune system or can be treated with ANTIBIOTICS
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Antibiotic Resistance Currently, many bacteria are
becoming resistant to antibiotics This is because of antibiotics being
over prescribed (often for viral infections, which they
have no effect on)
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Viruses Virus: a NONLIVING protein coat
surrounding either DNA or RNA Viruses are NON-LIVING:
Do not grow or develop Do not obtain or use energy Do not respond to environment
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However, viruses have some properties of living things:
Have genetic material DNA or RNA
Can replicate--but only by using the host cell
Can evolve
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Vaccines PREVENT viral infection Person is injected with a
weakened virus. The immune system can later
recognize the normal virus and fight it off
Ex: measles, mumps, rubella (MMR), smallpox, polio, flu strains (swine flu)
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Viral infections are fought by the immune system or with anti-viral drugs. Some viruses are too strong and too
fast for the immune system to fight. These viruses lead to:
Epidemics (over large areas) Pandemics (over whole countries)
To treat mass outbreaks: contain the area and quarantine the infected.
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Common Viruses
Influenza (Flu Virus)Kills 30,000 Americans every year
Human Papilloma Virus (HPV)
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Deadly Viruses
Ebola virusAfrica~90% mortality rate
SARS (Severe acute respiratory syndrome)
China 2002-35328 cases, 349 deaths
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Virus Bacteria
CompareContrast Contrast
Double Bubble: Viruses vs. Bacteria pg. 60
Prevent with: Most are:
Treat with: Treat with:
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Virus Bacteria
Double Bubble: Viruses vs. Bacteria
CompareContrast Contrast
Prevent with: Vaccines
Most are:Harmless
Treat with: Anti-viral drugs
Treat with:Antibiotics
Not Alive!
Make you sick
Cause Infectious Diseases
Prokaryote Cells
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The Immune System Part 2
Human Body SystemsChapter 40-2
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Immune System
Immune SystemImmune System: bodies defense system against disease
White Blood Cells (WBCs) fight infection through inactivating foreign substances or cells soldiers of your defense system
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Immune Divisions Overview
Nonspecific Defenses Specific Defenses
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Nonspecific Defenses Body protects itself the SAMESAME way
regardless of what is invading it Fast-acting Response Lines of Defense
1. Skin- protective barrier 2. Fever- raises body temp. to kill
infection 3. Inflammation- swelling & redness
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Specific Defenses
Immune system attacks specific specific pathogen
PathogenPathogen can be recognized by its antigenantigen
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HI, MY NAME IS
Pathogens & Antigens Pathogens (things that infect you)
contain antigens AntigensAntigens are like chemical markers
(name tag) that tell what the pathogen is
Haha! I am the pathogen.I have invaded you!
Antigen
Swine Flu Virus
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WBCs & Antibodies WBCsWBCs can recognize the
antigens because they have antibodies.
AntibodiesAntibodies are proteins that recognize and bind to the antigen because they fit together Antibodies mark the
pathogen for destructionAntibody
Nooo!
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Types of WBCs White blood cells are produced by
bone marrow & lymphatic glands MacrophagesMacrophages: “eat” & destroy
pathogens Some pathogens are marked for destruction
by antibodiesantibodies LymphocytesLymphocytes (B-cells & T-cells)
B-cells- make antibodies T-cells- recognize & kill pathogen
Nooo!
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1. Fighting Pathogens in Body B-cells- make antibodies
Primary Response: 3-6 days B-cell activated: antibody binds to antigen to
mark it for destruction B-memory cells “remember” antigen in case
of second infection
B-cell
Antibody
Nooo!
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Secondary Response: 2-3 days Exposure to same antigen later B-memory cells respond faster to
make antibodies Do not get sick Memory Cells = IMMUNITY
B-memory
I remember…
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2. Fighting Pathogens inside Cells
T-cells: recognize and kill infected self cell Helper T-cells recognize antigen and:
tell B-cells to make antibodies attract Killer T-cells: kill infected self-cell by
injecting enzymes (trained assassins)
Hello, I am a deadly Killer T-cell
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HIV A retrovirus (has RNA) that targets
and kills Helper T-cells Leaves immune system defenseless
against disease Develops into the disease AIDS
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Acquired Immunity
Immunity is acquired after exposure to antigen
2 Kinds Active ImmunityActive Immunity: you make antibodies
in response to antigen Vaccine Natural exposure to pathogen
Passive Immunity: you obtain antibodies from another source
Mother’s milk gives baby antibodies
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Helper T-cell
B-memory
I am a deadly Killer T-cell.
Die infected cell!
InfectedSelf Cell
Haha! I am the pathogen.I have invaded you!
Antigen
B-cell
Nooo!
The Immune Response Team
Antibodies
I am the all-knowing Helper-T cell. I recognize
the antigen.
I remember…Antibody-mediated Immune Response
I have invaded your tissues!
I have invaded your cell!
Cell-mediated Immune Response
Killer T-cell
Macrophage
I will eat invaders!!!
Plasma cell
Suppressor T-cell
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Word Bank (Homework) Pathogen Immune system White blood cells Non specific defenses Specific defenses Antigen Antibodies Macrophages Lymphocytes (B cells & T cells)