the human body. bellwork 11/8 why does our body sweat when we are hot or shiver when we are cold?
TRANSCRIPT
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THE HUMAN BODY
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Bellwork 11/8 Why does our body sweat
when we are hot or shiver when we are cold?
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Maintaining Homeostasis
Shivering occurs when your muscles rapidly contract and relax.
Sweating helps to cool your body. Your internal body temperature will be close to 37 degrees C. If you become sick, you body temperature may rise but it will return to 37 degrees C when you are well again.
This action produces heat that helps keep you warm.
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HomeostasisThe maintenance of a stable
internal environment in the body in spite of changes in the external environment
Constantly working to keep the body in balance
Outside factors make this hard
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Stress and Homestasis
Stress- The reaction of your body to potentially threatening, challenging, or disturbing events
Your heart may beat more rapidly Your breathing may increase Your endocrine system might release a
chemical called adrenaline into your bloodstream
Adrenaline gives your body burst of energy and prepares your body to take action
Your muscles work harder and require more oxygen
Oxygen is carried to the circulatory system Your heart then beats faster so that more
oxygen can get into your body.
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Body OrganizationCellsTissuesOrgansSystems
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CellsBuilding blocks of lifeBody is composed of billions of
different cellsWhen cells of the same type
work together to do a job they form a TISSUE
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Tissues
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TissuesFour main types
EpithelialNervousMuscleConnective
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Epithelial TissuesCover and protect underlying
tissueSkin for example
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Nervous TissueSend messages through the
bodyFound in
Brain, nerves, and sensory organs
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Muscle TissueMade of cells that contract and
relaxProduce movement
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Connective TissueMany jobs
Joins/supports/insulatesKeeps organs from falling apartExamples
Bone and blood
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OrgansTwo or more tissues working
together form an ORGANStomach uses all four types of
tissues to perform digestion
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Body SystemsOrgans working together form
systems12 major systems in the bodySome organs are part of more
than one system at a time
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The Skeletal System
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Skeletal SystemMade of bones, cartilage and
the connective tissue that holds the bones together
206 in adultsMultiple Functions
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Functions of Skeletal System
ProtectionStorageMovementBlood Cell Formation
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ProtectionPrevents damage to organs
Skull protects brainRibcage protects heart, lungs,
etc…Spine protects spinal cord
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StorageMinerals needed to help
nerves and muscles workLong bones can store fat for
energy
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MovementAllow for places
for muscles to attach
Movement of skeletal muscles allow to move
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Blood Cell FormationMarrow of
some bones make cells of the blood
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Bone StructureMade of connective tissue and
mineralsMinerals deposited by cells
called osteoblastsTwo kinds of tissue
Compact bone and spongy bone
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Bone StructureCompact Bone
Rigid and denseSpongy Bone
Many open spacesProvide strength and support of
bone
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Bone StructureBone Marrow
Soft tissue inside boneRed marrow produces red and
white blood cellsYellow marrow stores fat
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Bone GrowthBones start as cartilage and
harden as you get olderTips of ears and nose the
cartilage never gets hard
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JointsPlace where two or more bones
meetTwo major types of joints
Immovable Movable
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Immovable JointsLittle or no movement is
allowedBones of skull are held
together this way
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Immovable Joints
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Movable JointsHeld together by connective
tissue called ligamentsThree Main Types
Gliding JointBall-and-Socket JointHinge Joint
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Movable JointsCartilage
Protective covering over ends of bones
Keeps bones from rubbing together
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Gliding JointAllow bones to move past one
anotherFound in hand and wrist
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Ball-and-Socket JointAllows for movement in many
different directionsRotate at this joint
ShoulderHip
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Hinge JointOpen and close like a doorKneeElbow
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Muscular System
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The Muscular SystemMade up of all the muscles
that let you moveTwo Main Types
InvoluntaryVoluntary
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Involuntary MusclesMuscles that you do not have
to think about to controlAct on their own Important for:
Breathing, heart beating, blinking, etc…
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Voluntary MusclesMuscles that you control with
thoughtMovements
Smiling, speaking, raising your hand, walking, etc…
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Muscle TissueThree Types of Muscle Tissue
Smooth MuscleSkeletal Muscle Cardiac Muscle
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Smooth Muscle Tissue Involuntary Muscle
Makes up the inside of many organs
Act without thoughtExample: digestion in the
stomach is automatic
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Smooth Muscle
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Skeletal Muscle TissueVoluntary Muscles
Attached to bones by tendonsResponsible for movingCalled striated muscles
Appear bandedWith lots of use become tired
(fatigued)
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Skeletal Muscle Tissue
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Cardiac MuscleFound only in heart Is involuntary like smoothStriated like skeletal
Unlike skeletal it never gets tired
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Cardiac Muscle Tissue
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Muscles at WorkFunction by contractingMessage from nervous systemWork in pairs
When one muscle contracts its mate relaxes to its original length
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Muscles at Work
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Muscles at Work
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Muscles at Work
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Strength and FlexibilitySome muscles can be made
stronger and made to last longerRegular exercise can helpResistance and Aerobic
Exercise
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Integumentary System
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Integumentary SystemMade up of skin, hair, and
nailsCovers the body and helps
maintain homeostasisSkin is largest organ in body
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Functions of SkinProtecting the BodyMaintaining TemperatureEliminating WastesGathering InformationProducing Vitamin D
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Protecting the BodyForms a barrier
Keeps disease-causing microorganisms out
Keeps important substances inside bodyPrevents you from drying out
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Maintaining TemperatureBlood vessels in skin will
enlarge when you get hotAllows more blood to area and a
temperature drop to occurSweat glands produce
perspiration
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Eliminating WastesSweat contains waste
materialsKeeps some harmful materials
from building up in your bodyThis is why sweat is salty
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Gathering InformationLots of nerve endings in skin
As you touch things your body collects informationPressure/pain/temperature
Keeps you safe
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Producing Vitamin D In presence of sunlight
Important for healthy bonesHelps cells to absorb calcium
in foodOnly need a few minutes of
sunlight each day
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Layers of the SkinTwo Main Layers
Epidermis
Dermis
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Layers of the Skin
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The EpidermisOuter layerThinner than dermisNo nerves or blood vesselsCells of epidermis (epithelial)
are replaced about every 4 weeks
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The EpidermisOuter layer is dead cells
This is what protects and cushions
Shedding of dead cells carries away bacteria
Melanin is produced in epidermis
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The EpidermisMelanin protects skin by
creating a tan when exposed to sun light
Also cells in epidermis that produce fingernails
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The Dermis Inner layer of skinHas:
Nerves/Blood Vessels/Sweat Glands/Hairs/Oil Glands
Sweat and oil reach surface through pores
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The DermisHair grow from follicles
Hair you see is made of dead cells
Oil produced helps make hair waterproof and keep skin moist
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Injuries, Disorders, and Diseases of the Skeletal
System Fractures Postural Deformities Arthritis Cancer Osteoporosis Rickets
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Fractures A fracture is any break in the bone About 6 different types
We will cover 3 Simple Greenstick Compound
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Simple Fractures A clean break of the bone
Bone is often split into two pieces
No damage to skinMay result in bruising
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Simple Fracture
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Greenstick Fracture Bone is not completely broken
One side shows break Other just bends
Most commonly seen in children Due to pliable nature of young
bones
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Greenstick Fracture
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Compound Fracture Also known as an “Open” fracture Broken end of bone pushes out
and breaks through skin Can result in damage to tissues
and infection
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Compound Fracture
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Arthritis Inflammation of one or more joints Causes range depending on type of
arthritis Osteo arthritis is caused by wearing
away of cartilage Rheumatoid arthritis is caused when
body attacks and breaks down cartilage (autoimmune disorder)
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Rheumatoid Arthritis
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Injuries, Diseases and Disorders of the Muscular System
Sprains Strains Dystrophy
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Sprains and Strains A sprain is when a ligament gets
stretched too far Symptoms of a sprain are: pain, swelling, and
bruising of the affected joint A strain is an injury to a muscle or tendon,
usually occurring when stretched too far Can lead to muscle tears when a rip occurs in
the muscle or tendon
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Muscle Tear
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Dystrophy Refers to a group of diseases All result in a wasting of the
muscles Loss of control May extend to internal organs
Leading to problems with organs functioning or even death
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Injuries, Disorders, Diseases of Skin
Hundreds of different problems can occur with the skin and underlying connective tissue
Will look at just twoAcnePsoriasis
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Acne Term for pimples on the skin At puberty the oil glands of the
skin start producing an oily material (sebum) Sometimes the wall of the oil gland
breaks and spills the sebum within the skin which causes redness, swelling, and pus (a pimple)
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Acne
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Psoriasis Causes are unknown Runs in families Results in areas of the skin
growing much faster than others Creates red and scaly patches that
itch
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Psoriasis
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Can Happen On the Nails as Well