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Transcript of Biology
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BiologyAnatomy and Physiology
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Organization Within the Body
• Cells- Basic unit of life, smallest functional unit within living things– Cell Specialization- different types fo cells complete different tasks
within the body
• Tissues- Group of cells working together to complete a common task (4 types)
• Organs- A structure made of 4 different types of tissues working together to complete a major task
• Organ System- A group of organs working together within the body to complete a number of major related tasks within the body
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Types of Tissues in the Body
• Epithelial- covers body, and lines digestive system and major organs of the body
• Nervous- relays messages within the body
• Connective-Holds organs in place and binds different parts of the body together
• Muscle- capable of contraction, causes internal and external movement
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Major Body Systems
Nervous System Integumentary System Skeletal System Muscular System Circulatory System
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Functions of Body Systems
Nervous- coordinates the body’s response to changes in internal and external conditions
Integumentary- serves as a barrier against infection and injury
Skeletal- aids in movement, stores mineral reserves a provides a site for blood cell formation
Muscular- voluntary movement, circulates blood, and moves food through digestive tract
Circulatory- brings materials to and from cells, fights infection, and regulates body temperature.
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Major Body System
Respiratory System Digestive System Excretory System
Endocrine System Reproductive System Lymphatic System
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Functions of Body Systems (cont.)
Respiratory- provides oxygen and removes carbon dioxide
Digestive- converts food into glucose and other usable molecules for cells
Excretory- eliminates wastes and maintains homeostasis
Endocrine- controls growth, development, metabolism, and reproduction
Reproductive- produces reproductive cells
Lymphatic- helps protect the body from disease
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HomeostasisMaintaining relatively stable conditions
within the body
Examples:
~maintaining constant body temperatures
~maintaining “normal” amounts of oxygen and carbon dioxide in the body
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Body Systems Work Together to Maintain Homeostasis
EXAMPLENutrient Delivery and Waste Disposal
Digestive System breaks down food and delivers nutrients (glucose) to Circulatory System
Oxygen moves from the air into the lungs (Respiratory System) and is delivered to the circulatory system
Circulatory System delivers oxygen and glucose to cellsCells complete Cellular Respiration and breakdown glucose and
use energy to regenerate ATPWaste products of cellular respiration (CO2 and H2O) are released
from cells and taken back to lungs by circulatory systemLungs exhale waste
The NERVOUS SYSTEM Coordinates all these interactions!
The bodies cells need nutrients to complete tasks and perform chemical reactions, when these nutrients are used wastes are created that must be removed
Cells need glucose and oxygen for cellular respiration to make more ATP
Carbon dioxide and water are created in this process
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Feedback Inhibition(Feedback Loops)
The process by which the product of a system shuts down the system or limits its operation
Example fat cells grow larger and larger.as the cells grow they release
leptin (chemical messenger)leptin signals the brain to
suppress the appetite
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The Nervous System Basics
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Function of the Nervous System
Mediates (coordinates) communication between different parts of the body and the body’s interactions with the environment
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The Neuronspecialized cells within the nervous system
Axon terminals
Myelin sheath
Nodes
Cell body
Axon
Nucleus
Dendrites
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Neurons transmit messages• Nerve impulse = Message
Dendrites- pick up message from environment or other neurons. Sends message to cell body
Cell body-performs normal cell tasks for cell, relays message to next neuron through the axon
Axon- Carries message from the cell body to the next neuron.myelin sheeth-coating that insulates and speeds up
message.axon terminal- releases chemicals, “neurotransmitters” to stimulate the next neuron to “fire” or continue the nerve
impulse.threshold- the minimal amount of stimulus required
to cause the next neuron to “fire” or continue the impulse
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Nerve Impulses Are Electrical As They Travel Through The
NeuronOutside of cell
Inside of cell
Cell membrane
High Potassium Ion (K+)Concentration InsideLow Potassium Ion (K+)Concentration Outside
High Sodium Ion (Na+) Concentration OutsideLow Sodium Ion (Na+)Concentration Inside
Resting Potential-When a neuron is ready “fire” if it is hit with a “threshold” stimulus
1)Sodium is pumped out by a protein pump
*ATP needed
2)Potassium ions leak through cell membrane creating a negative charge inside cell andpositive charge outside cell
RESTING POTENTIAL NOW REACH WHEN INSIDE HAS BECOME NEGATIVE
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At the leading edge of the impulse, the sodium gates open. The membrane becomes more permeable to Na+ ions and an action potential occurs.
As the action potential passes, potassium gates open, allowing K+ ions to flow out.
The action potential continues to move along the axon in the direction of the nerve impulse.
At rest.
Action Potential
Action PotentialAction Potential
Movement of the “Action” PotentialAction Potential = A electrical charge moving through a neuronCAUSED BY SODIUM GATES OPENING ALLOWING Na+ IN
Once Action Potential Passes Na + Gates Close and Na+ Pumped Back Out and Resting Potential Restored
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Types of Neurons
Sensory Neurons-detect stimulus send a nerve impulse to brain (sensation)
Interneurons-located in the brain, process information received and formulate responses (thought)
Motor Neurons- carry an “action” or response impulse from the brain back to the body (response)
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REFLEX ARC
What is the pathway of nerve impulse as your hand touches a hot stove?
SENSORY NEURONINTERNEURONMOTOR NEURON
This is called the a reflex or reflex arc?
This process can also occur with conscious control. Can you think of an example of this?
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Sense Organs
• Nose=Smell
• Mouth=Taste
• Ears=Sound
• Eyes=Sight
• Skin=Touch– All have specialized sensory neurons to pick
up or detect stimulus that transmit impulses to the brain for processing
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The Central Nervous System
• Consists of the brain and spinal cord• Both the brain and spinal cord is wrapped in 3
layers of connective tissues called the meninges.– dura mater, arachnoid, pia matter
• Between the meninges and the brain/spinal cord is cerebrospinal fluid– Bathes brain and spinal cord– Shock absorber– Exchange of nutrients and waste between blood and
nervous tissue
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The Brain
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• http://kidshealth.org/misc/movie/bodybasics/bodybasics_brain.html
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The Spinal Cord• Like a “major telephone line”
• 31 pairs of spinal nerves branch out from the spinal cord to the rest of the body.– Reflexes may be processed directly by the
spinal cord
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The Immune System Basics
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Pathogens of Disease• Bacteria
– Bacteria are cellular (prokaryotic) and are
Living organisms
- 3 common shapes• Bacilli (rod), cocci (circular), spirilli (spiral)
– Cause disease by• Destroying cells and tissue• Releasing toxins in body
– Examples• Strep Throat, tetanus, anthrax, syphilis, tuberculosis, MRSA, food
poisoning, chlamidia, gonorhhea– Preventions
• Some have vaccines, personal hygiene, antiseptics– Treatments
• Antibiotics- substances that can be administered that kill the bacterial cells causing infection
– Usually break down cell walls or interfere with metabolic processes
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Pathogens of Disease
• Viruses– Noncellular particles
• Genetic material (DNA or RNA)• Capsid-protective coating made of protein
– Not considered living• Cannot reproduce on own, no metabolic processes, no response to stimulus
– Cause disease by• Disrupting cellular activity and destroying cells
– Examples• Common Cold, Flu, Small Pox, HIV, chicken pox, genital warts, herpes, hepatitis
– Prevention• Some have vaccines, personal hygiene, antiseptics
– Treatments• None- body must defeat on own, some the body cannot defeat EVER• Some drugs (antiviral) can slow the spread of virus within the body
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Function of the Immune System
to fight infections and protect the body from invaders.
White Blood Cells-Specialized cells of the immune system
fight disease
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Pathogens
• Bacteria (food poisoning, tuberculosis, pneumonia)
• Viruses (influenza, AIDS, colds,ect..)• Protists (malaria and others)
Infect body and cause disease!
Antigen- a substance on the surface of a pathogen that triggers an immune response (DEFENSE).
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Nonspecific Defenses
• Skin- Creates barrier between external environment where pathogens exist and the inside of the body– Pathogens must enter body to cause
infection/sickness• Inflammatory Response (Swelling)-Blood
vessels expand and WHITE BLOOD CELLS (disease fighters) enter the wound or infection site
• Fever- Body raises core temp. to try to kill pathogen– Some pathogens can only survive under certain temp.
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Specific Defenses
• Humoral Response– Involve Special Types of White Blood Cells
• T-Helper Cells activate B-Cells when they detect invaders (pathogens)
B- Cells (B lymphocytes) produce plasma cells
Plasma cells produce antibodies– antibodies=substance that will cling to the antigen on the
surface of a pathogen an immobilize the pathogen or cause them to cling together.
– Once infection detected by helper T many plasma cells are generated B cells to produce antibodies
• Macrophages (PHAGOCYTES)-engulf and destroy immobilized or inactivated pathogens
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Specific Defenses
• Cell Mediated– Helper T Cells- recognize pathogens and
activate B cells (Humoral Response) and Cytotoxic (Killer) T Cells
– Killer T Cells- Once activated kill pathogen directly
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Immunity
• Bodies ability to not become sick against a specific invader/pathogen– It takes a while for plasma cells to figure out what
antibody will kill a specific pathogen, many antibodies are produce in “trial and error method”
– Pathogen causes infection and sickness in meantime– Eventually plasma cells produce an antibody that
works.– Special B memory cells remember the correct
antibody that worked against that specific invader– The next time the invader enters your body the
Immune system knows how to destroy it before it can cause infection or disease.
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Vaccine
• Altered (weakened) form of the real pathogen Scientists alter in lab – No longer capable of causing disease– Injected in body– Allows body to recognize and immune system build
immunity to the pathogen
• When the real pathogen enters body your body is already immune (knows how to kill it before it can cause infection/sickness)
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Treatments for Diseases
• Bacterial Diseases- bacteria are living things– Antibiotics-drugs that interfere with the
chemical processes of living things• Specifically harm bacterial cells without causing
harm to us
• Viral Diseases-not living– Body must defeat on own, no cures
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A.I.D.S and the Body
• AIDS infects and kills Helper T Cells• Helper T Cells detect pathogens/invaders• Once enough T Helper are killed by virus the
body is no longer capable of recognizing invaders
• RESULT- Person becomes seriously infected or sick from pathogens that a healthy person may defeat rather easily– Usually die from simple infections
(cold,flu,pneumonia)
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The Digestive SystemThe Digestive System
• Function- convert foods into
simpler substances that can be
used by cells.
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DigestionBreaking food particles down into simple substances
that cells can used by cells
Mechanical
• Moistening and breaking food particles into smaller pieces
Chemical
• Breaking down chemicals within food into simpler substances– Proteins amino acids– Fats lipids– Carbs
• Polysachararides /starches monosacharrides / sugars (glucose)
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Digestive Enzymes
• Mouth• Salivary Amylase- carbs
• Stomach• Pepsin (proteins)
• Small Intestine (from Pancreas)• Amylase- carbs• Trypsin- proteins• Lipase- fats
• Small Intestine• Maltase, Sucrase, Lactase- carbs • Peptidase- proteins
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Mouth
• Mechanical Digestion– Chewing– Moistening (saliva)
• Chemical Digestion– Salivary Amylase
• Enzyme breaks down
carbs
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Esophagus• Epiglottis covers trachea (windpipe) and forces food into
esophagus• Tube that leads from throat to stomach (lined with
smooth muscle)– Peristalsis- wavelike muscular contraction that helps
“push” food downward.
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Stomache
• Mechanical Digestion- HCl helps “liquefy” foods and churning motion also breaks food into smaller pieces– Food is now chyme
• Chemical Digestion– Pepsin (breaks down
Proteins)
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Liver
• Produces Bile-– Bile is a substance that acts as a detergent and breaks
down fat molecules• Bile is stored in gall bladder and then released into the small
intestine
• Has over 500 other critical
functions– Mainly breaking down toxins
And “purifying” blood
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Gall Bladder
• Stores Bile that is made by liver– Releases bile Into small intestine
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Pancreas
• Produces many digestive enzymes– These enzymes are released into the small
intestine– Also produces base
• Alkaline substance
That neutralizes stomach
Acid in small intestines
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Small Intestine
• Name refers to diameter, is actually much longer than large intestine
• 6 meters long– Almost 20 feet!
• 3 Parts – Duodenum-chemical digestion– Jejenum-chemical digestion & nutrient
absorbtion– Ileum- nutrient absorbtion
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Nutrient Absorption in Small IntestineNutrient Absorption in Small Intestine
• takes place in jejenum and ileum• Chyme is now well digested and rich in nutrients• Folded surfaces are covered with fingerlike projections called villi
– Villi have are intervened with capillaries from circulatory system– Nutrients are absorbed into bloodstream
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Large Intestine (Colon)
• Water absorption
• Production of vitamin K– Accomplished by bacterial cells in digestive
tract
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