What can the human body withstand? - PowerPoint Presentation

Slide1

What can the human body withstand?http://www.youtube.com/watch?feature=player_detailpage&v=5b9Rh7ufgO4

Lesson

3.1 Introduction to EnergySlide2

Mauro Prosperi

The Story of Mauro

Prosperi

,

a 39 year old Italian policeman took part in the 1994 Marathon des Sables (Marathon of the Sands) in Morocco. Slide3

A Major SandstormPartway through the six day, 145 mile (233 km) event, a sandstorm caused him to lose his way. He ended up disoriented, after which he ran and walked about three hundred kilometres in the wrong direction.

Mauro had a compass but no reference points and it took a while before he realized that he had strayed off the route.

"I wasn’t panicked, I just despaired. Fear, the type that doesn’t paralyze you is important. It forces you to think and concentrate".

"I stopped and turned my back to the wind, then covered my face with a special sandstorm scarf and glasses. I eventually found a log to block the wind, but I needed to keep moving a bit to keep from getting buried. The storm lasted eight hours, and when the winds died down, I didn’t know I was lost".Slide4

Shifting Into Survival ModeMauro shifted immediately into survival mode and the first thing he did was to urinate into a water bottle. He knew that this first urination was going to be the clearest and most drinkable in the event that he didn’t come across a fresh water supply. Mauro knew enough about desert survival to only walk in the morning and evening, and to relax in the shade during the midday heat.

After three days of wandering, taking sips of that initial urine, he was enveloped by another sandstorm that lasted for twelve hours.

Slide5

Drinking Bat’s BloodHe found a small Muslim shrine, hung his Italian flag out front and crawled inside, where he finally found some nourishment. He caught two small bats, twisted off their necks and drank their blood.* Cooking first, and then eating the bats would have just accelerated the dehydration

.Slide6

And Then An Attempted Suicide!"I reasoned that if I died in that shrine, by body would eventually be found. If I died while walking, my body would never be found. I wanted my family to be able to recover my body so they could come to terms with my death". He wrote a note to his wife with a piece of charcoal and then slit his wrists and waited to die, but his blood had thickened and wouldn’t drain.

But Mauro took that as a sign!Slide7

Renewed Determination And Finding An Oasis

"It gave me more confidence. I started to view the desert as a place where people can live. I started to think of myself as a man of the desert. I wanted to see my family and friends again and I concentrated on that".

He decided again to try and walk his way to safety and headed for a mountain range in the distance.

Five days after leaving the shrine, and eight days drinking almost nothing but urine, he found a small oasis.

Mauro resisted the temptation to drink his fill of water which would have caused severe cramping, and instead took a reasonable, calculated amount. Slide8

Taken To Safety By NomadsTwo later days he encountered some Tuareg nomads, who took him on camel-back to a nearby Algerian military camp and from there to a hospital. He was around 186 (300 km) miles off route, and reportedly had lost between 30 and 40 pounds (18 kg) in body weight. Slide9

1.Digestive system-no food/water2.Integumentary system-Sweating, sun burn3.Cardiovascular system-little bit of everything4.Nervous system-Mirages5.Respiratory system- Sand in lungs, heat6.Endocrine system-7. Urinary system-drink urine

8. Muscle System-

List factors

that affected Mauro’s chance of survival and which body systems were affected:Slide10

Essential Question:1. What are the resources the human body needs to survive?Oxygen

Water

FoodSlide11

Create This Chart in Your Lab Journal

Activity 3.1.1 Resources for Life

Pair up with a partner to complete your Powering The Human Body ChartSlide12

Essential Question:2. What role does food play in the human body?Food serves as a source of energy for the body as well as a source of fat and insulation. This fat cushions organs and protects the human body.

FoodSlide13

Food includes macromolecules (Lipids, Carbohydrates & Proteins), as well as vitamins & minerals Carbohydrates Quick energy source

Lipids

Long term energy source, cushioning of organs,makes up much

of brain Proteins Build & repair body tissues FoodSlide14

How long can we go without foodMost doctors agree that healthy humans can go up to eight weeks without food as long as they have

water.

Being

strong and in good physical shape can help you survive longer, but so does having extra body fat. Body stores energy needed to live in the form of fat, carbohydrates and proteins. Carbs

are the first thing to be used up Fat goes next, which explains why people with more of it can survive longer. Then proteins. If you get to the point that your body is using up proteins, basically the body itself, then you're in bad shape.Slide15

WaterEssential Question:3. What role does water play in the human body?

1. Dissolves

other materials & allows them to flow (in blood) 2. Gives cells structure (just right amount needed to prevent shrinking and exploding)

3. Allows food to digest & pass through intestinal walls into bloodstream 4. Carries waste products out of body (in urine) 5. Helps send electrical messages 6. Regulates homeostasis of body temperature (evaporation/sweating)

7. Lubricates structures (i.e. allows fecal matter to pass through large intestine)

8. Protective barrier around organs

Slide16

How long can we live without waterIn hot conditions with no water, dehydration can set in within an hour.

A

baby locked in a hot car or someone who is physically overexerted in the heat without replacing fluids can actually die in a period of several hours

.We lose water through sweat, urine, feces and even breathing. This water needs to be replaced in order for our organs to continue to work properly.

In severe heat, an adult can lose as much as 1.5 liters of water through sweat alone.The main risk without water in high heat is that your body temperature will continue to rise and you'll suffer from heat stroke. Drinking water will cool you down and lower your core temperature.Slide17

Essential Question:4. What role does oxygen play in the human body?Oxygen is required to feed the body’s tissues and produce ATP in aerobic cellular respiration. The physical act of breathing assists with gas exchange and the removal of harmful gases from the body.

OxygenSlide18

Of all the chemical elements, oxygen is the most vital to the human body. We would survive for only minutes without oxygen. Oxygen is the life-giving, life-sustaining element. Approximately 90% of the body's energy is created by oxygen.

Nearly all of the body's activities, from brain function to elimination, are regulated by oxygen. The ability to think, feel and act is derived from the energy supplied by oxygen.

Why is Oxygen ImportantSlide19

Body Systems EffectedEssential Question:5.

What

human body systems work to create, process or distribute the body’s main power sources? Slide20

Body Systems EffectedSlide21

Activity 3.1.2 The Rule of Threes The

Rule of Threes states that the

human body can survive for:3 minutes without oxygen

3 days without water3 weeks without foodHowever... other factors can prolong or

shorten these

times

.

Complete

Activity 3.1.2 and fill in the rest of

their chartSlide22

Essential Question6 How do personal factors and environmental factors impact the body’s ability to survive without air, food or water?Slide23

With a group of 4 complete your graphYou have 20 minutes to complete

Activity 3.1.2Slide24

OxygenFactors that can prolong

.

Age

children and Mammalian ResponseEnvironmentTemperature- colder is betterAltitude- lower is better

Factors that can shorten.AgeLack of oxygen transfer as age increases due to environmental and lifestyle choices.EnvironmentTemperature- warmer is worseAltitude- less oxygen at higher altitudesSlide25

Factors that can prolong.

Activity

LevelLower activity level uses less waterEnvironmentTemperature- colder is betterFood intakeSome foods contain higher amounts of water

Factors that can shorten.Activity Level

Increased activity leads to higher level of cellular respiration resulting in increased water loss. as well as perspiration.

Environment

Temperature- warmer is worse = increased perspiration.

Age and Gender

Women have less water

Children have a greater surface area to volume ratio.

WaterSlide26

FoodFactors that can prolong

.

Initial body state

people with a higher BMI have more stored energyMetabolic rateAdults lowerWomen lowerDifferences among individualsEnvironment

Temperature-Average temperatures better.Factors that can shorten.Initial body statepeople with a lower BMI have less stored energyMetabolic rate

Children higher

Men higher

Differences among individuals

Environment

Extremes are worse.Slide27

Discovery Channel Human Body: Pushing the Limits Video: Carbohydrates and Fats Fueling the BodySlide28

Preparing OurselvesHow can a person prepare their bodies for a fuel (food) shortage?Slide29

CarbohydratesFatsProtein Nucleic Acids

MacromoleculesSlide30

Homeostasis

The maintenance of relatively stable internal physiological conditions (as body temperature or the pH of blood) in higher animals under fluctuating environmental conditions.

Macromolecule

A very large molecule (as of a protein, nucleic acid, or carbohydrate) built up from smaller chemical structures.

Resource A natural feature or phenomenon that enhances the quality of human life.

Key TermsSlide31

What helps food /Macromolecules Digested?Enzymes whichact as a catalyst

Lesson 3.2 DigestiveSlide32

What is a catalyst?Catalysts help a reaction happen faster but do not change themselves during the reaction.A

catalyst

 lowers the amount of energy needed so that a reaction can happen more easily. A catalyst is all about energy.CatalystsSlide33

Add 10 mL of hydrogen peroxide to a graduated cylinder. Add 1 drop of detergent solution. Swirl gently and watch the solution for any bubbling. Use the end of a popsicle stick to add a small amount of yeast to the hydrogen peroxide in the graduated cylinder and swirl

.

Place the graduated cylinder on the table and watch for any bubbling.Hold the graduated cylinder to see if there seems to be any change in temperature.

Catalyst ExperimentSlide34

Pair up with a partnerComplete parts A,B and CShare with class your creations

Activity 3.2.1- Action MoleculesSlide35

EnzymesStructurally- enzymes are

proteins

and have a complex, 3-dimensional shape

Functionally- they act as biological catalysts; there are different models concerning function (Lock & Key Model and Induced Fit Model)Action- enzymes work by lowering the activation energy of chemical reactions; they are very specific, with each enzyme working on a particular substance, the

substrateSlide36

Coenzyme: A substance that enhances the action of an enzyme. Coenzymes are small molecules. They cannot by themselves catalyze a reaction but they can help enzymes to do so.

Coenzymes

are organic

nonprotein molecules that bind with the protein molecule (apoenzyme) to form the active enzyme (holoenzyme).CoenzymesSlide37

Lock-and-Key Model - A model for enzyme-substrate interaction suggesting that the enzyme and the substrate possess specific complementary

geometric shapes that

fit exactly into one another. Like a key into a lock, only the correct size and shape of the substrate (the key) would fit

into the active site (the key hole) of the enzyme (the lock). Induced-fit model- A model for enzyme-substrate interaction to describe that only the proper substrate is capable of inducing the proper alignment of the active site that will enable the enzyme to perform its catalytic function. It suggests that the active site continues to change until the substrate is completely bound to it

, at which point the final shape and charge is determined.

Models of

Enzyme Function Slide38

Which foods provide the most energy for the body?Carbohydrates – Quick energy source

Fats- Long term energy source

Lesson 3.2 FoodSlide39

Carbohydrate Lipids

P

roteins

Nucleic AcidsWhat are the major classes of macromolecules found in our bodies Slide40

MacromoleculesWhat is the monomer/building blocks of Macromolecules

Carbohydrates-monosaccharides (simple sugars)

Lipids- glycerol and fatty acids

Proteins- amino acidsNucleic Acids- neucleotides

What are the chemical structures MacromoleculesWhat foods fall in each categoryhttp://www.youtube.com/watch?v=PYH63o10iTE&feature=player_detailpage

Discusses Monomers/ chemical structures, dehydration and

hydorloysisSlide41

Which body system helps harness the energy in foodThe Digestive SystemSlide42

Essential Question1. What are the functions of the digestive system?

http://

www.youtube.com/watch?v=nM5kMSjBrmw&feature=player_detailpage

– Dicusses the process of Digestion

The Digestive SystemSlide43

What type of macromolecule do you have?Carbohydrates

Chew the cracker but do not swallow

What is happening to the taste of the cracker

Flavor should turn sweet What is causing this reaction

The enzyme in our mouth is breaking down the macromoleculeActivity 3.2.2 Digestive System DesignSlide44

Activity 3.2.2 Digestive System Design

As you work through the activities in Section 3.2, you will explore how the body breaks down and absorbs the nutrients in some basic foods.

One person for each group is responsible for

researching one of the following groupsOral cavity, pharynx, and accessory organs such as salivary glands,uvula, tongue, and teeth

Esophagus and stomach Small intestine and large intestine Pancreas, liver and gallbladder We will look at how the body is able to process:Bread (Starch and Polysaccharides)

Butter (Lipids)

Steak (Protein)

Celery (Cellulose/Fiber)

Skittles (“Simple” Sugars

)Slide45

Digestive System 3.2.2 3.2.2 Student Resource Sheet-Trace bite of food

Review X-Ray of food being digested

Build

the Digestive system on Maniken using clay-Follow Student Instructions 3.2.2 Complete Activity 3.2.2 Slide46

3.2.2 Draw Digestive System DesignSlide47

The Digestive SystemSlide48

http://

www.rsc.org/education/teachers/learnnet/cfb/enzymes.htmSlide49

Essential Questions2.How does the structure of the organ in the digestive system relate to it function3.How do enzymes assist in the process of digestion

4.How does the digestives system assist in maintaining water balance in the bodySlide50

Have A Great BreakQuiz tomorrow covering slides 1-49, including the videos on slide 40 and 42.