an introduction to animal structure and function
TRANSCRIPT
AN INTRODUCTION TO AN INTRODUCTION TO ANIMAL STRUCTURE AND ANIMAL STRUCTURE AND
FUNCTIONFUNCTION
Structure verses FunctionStructure verses Function
Anatomy – study of structureAnatomy – study of structure
Physiology – study of functionPhysiology – study of function
Functional anatomyFunctional anatomy
Tissues – groups of cells that share a Tissues – groups of cells that share a common function.common function.
EPITHELIAL TISSUEEPITHELIAL TISSUE
Body covering and lines inner body Body covering and lines inner body cavities.cavities.
Attached to the Attached to the basement membranebasement membrane Basement membrane is an extra cellular Basement membrane is an extra cellular
matrix.matrix. Function primarily protection and Function primarily protection and
some secretion.some secretion.
Classification Can Be Based on Classification Can Be Based on Number of layersNumber of layers
Simple epithelium – single layerSimple epithelium – single layer Found on surfaces that participate in gas and Found on surfaces that participate in gas and
nutrient exchange.nutrient exchange. Stratified epithelium – several layersStratified epithelium – several layers
Found on surfaces that undergo frequent Found on surfaces that undergo frequent abrasion.abrasion.
Psuedostratified epithelium – Appear to be Psuedostratified epithelium – Appear to be more than one layer but are not. more than one layer but are not. Found on surfaces that are ciliated.Found on surfaces that are ciliated.
Classified by Cell ShapeClassified by Cell Shape
Squamous – Flat “tile like” cells.Squamous – Flat “tile like” cells. Meant for covering large areas.Meant for covering large areas.
Glandular or Cuboidal – Cube shaped Glandular or Cuboidal – Cube shaped cellscells Involved in storage and secretion.Involved in storage and secretion. line glands and line glands and mucous membranesmucous membranes..
Columnar – brick shaped cells.Columnar – brick shaped cells. Involved in storage and secretion.Involved in storage and secretion.
Chuck and MeChuck and Me
Psuedostratified columnar
Simple Columnar
Simple Cuboidal
Columnar Ciliated
Connective Connective TissueTissue
Bind and support other tissues.Bind and support other tissues. Sparse population of cells scattered Sparse population of cells scattered
through and extra cellular matrix.through and extra cellular matrix. Matrix usually secreted by the cells Matrix usually secreted by the cells
that make up the tissue.that make up the tissue. Matrix may be – web like fibers, Matrix may be – web like fibers,
gelatinous or fluid.gelatinous or fluid.
Connective Tissue Connective Tissue Fibers CompositionFibers Composition
Collagenous Fibers – Tensile StrengthCollagenous Fibers – Tensile Strength
Elastic Fibers – ElasticityElastic Fibers – Elasticity
Reticular Fibers – Connects layers of Reticular Fibers – Connects layers of tissue together.tissue together.
Major Types of Connective Major Types of Connective TissueTissue
LooseLoose - Packing material that holds - Packing material that holds organs in place and has all types of organs in place and has all types of fibers.fibers. Cells scattered throughout this type of Cells scattered throughout this type of
tissue are tissue are macrophages macrophages and and fibroblastsfibroblasts..
AdiposeAdipose – Stores fat and provides – Stores fat and provides insulation.insulation.
FibrousFibrous – – Dense and mostly collagenous Dense and mostly collagenous fibers.fibers. Tendons - attach muscle to bone.Tendons - attach muscle to bone. Ligaments – join bones together.Ligaments – join bones together.
Cartilage Cartilage – Collagenous fibers embedded in a – Collagenous fibers embedded in a rubbery matrix made of rubbery matrix made of condroitin sulfatecondroitin sulfate.. Secreted by Secreted by chondrocyteschondrocytes
Strong but flexibleStrong but flexible
Adipose Tissue
Loose Connective Tissue
Connective Tissue
BoneBone – Mineralized connective tissue. – Mineralized connective tissue. Osteoblasts - Osteoblasts - deposit a matrix of collagen that deposit a matrix of collagen that
is flexible but more brittle than cartilage.is flexible but more brittle than cartilage.
Hydroxyapatite Hydroxyapatite - calcium, magnesium and - calcium, magnesium and phosphorous matrix.phosphorous matrix.
Osteons (Haversian systems) Osteons (Haversian systems) are subunits of are subunits of bone that contain blood vessels and is bone that contain blood vessels and is innervated.innervated.
When and osteoblast gets caught in its own When and osteoblast gets caught in its own secretion it is called an secretion it is called an osteocyteosteocyte..
Cartilage
BloodBlood – Cells suspended in a fluid – Cells suspended in a fluid matrix called plasma.matrix called plasma. Plasma contains water salt and a variety Plasma contains water salt and a variety
of proteins.of proteins.
ErythrocyteErythrocyte – Red blood cells. Carry O – Red blood cells. Carry O22 and COand CO22 to and from tissues via to and from tissues via hemoglobin.hemoglobin.
LeucocytesLeucocytes – White blood cells involved in – White blood cells involved in the immune system.the immune system.
PlateletsPlatelets – Proteins involved in the clotting – Proteins involved in the clotting of blood.of blood.
Nervous TissueNervous Tissue
Senses Stimuli. Electrically Senses Stimuli. Electrically activated.activated.
AxonsAxons transmit impulses toward transmit impulses toward another neuron.another neuron.
Composed of Neurons.Composed of Neurons.
Neuron
Muscle Muscle TissueTissue
MyofibrilsMyofibrils made up of contracting proteins made up of contracting proteins called called actin actin andand myosin. myosin.
Individual units are called Individual units are called sacromeres.sacromeres. Most animals are primarily composed of Most animals are primarily composed of
muscle tissue.muscle tissue. Three primary types of muscle tissue:Three primary types of muscle tissue:
StriatedStriated - skeletal, voluntary - skeletal, voluntary CardiacCardiac - intercalated discs, involuntary - intercalated discs, involuntary Smooth – peristalsis, involuntarySmooth – peristalsis, involuntary
Skeletal Muscle
Smooth Muscle
Cardiac Muscle
Organs are made up of many layers of different tissues
Serosa, Sub Mucosa, Mucosa and Muscularis
Body PlanBody Plan Size and shape of the body depends on how Size and shape of the body depends on how
the animal interacts with its environment.the animal interacts with its environment. All cells must be bathed in an aqueous All cells must be bathed in an aqueous
environment for nutrient and gas exchange.environment for nutrient and gas exchange. Amoebas have a large surface area relative to Amoebas have a large surface area relative to
their volume.their volume. Tape worms are flat.Tape worms are flat. Hydra are gastric sacs exposed to water on all Hydra are gastric sacs exposed to water on all
sides.sides. Multicellular organisms have complex folds with Multicellular organisms have complex folds with
small tightly packed cells that are bathed in small tightly packed cells that are bathed in interstitial fluid.interstitial fluid.
Fusiform shape conducive for swimming fast
Body plan of Amoeba and Hydra
Small Intestine
RegulatingRegulating the Internal the Internal EnvironmentEnvironment
Homeostasis maintained through Homeostasis maintained through positive and negative feedback positive and negative feedback systems.systems.
Receptor Control center Receptor Control center EffectorEffector Receptor senses stimuliReceptor senses stimuli Control Center processes and directs a Control Center processes and directs a
command to the effector.command to the effector. Effector carries out the response.Effector carries out the response.
BioenergetiBioenergeticscs Metabolic Rate – Amount of energy an Metabolic Rate – Amount of energy an
animal uses in a unit of time.animal uses in a unit of time. Measured in Kilocalories or Calories.Measured in Kilocalories or Calories. Can be measured by:Can be measured by:
Amount of heat given offAmount of heat given off OO22 consumption consumption COCO22 emission. emission.
EndothermsEndotherms need more energy to maintain need more energy to maintain basic metabolic functions than basic metabolic functions than ectothermsectotherms
Basal Metabolic Rate – minimal amount of energy Basal Metabolic Rate – minimal amount of energy needed to maintain cellular functions for an needed to maintain cellular functions for an endotherm under no stress.endotherm under no stress.
Standard Metabolic Rate - minimal amount of Standard Metabolic Rate - minimal amount of energy needed to maintain cellular functions for energy needed to maintain cellular functions for an ectotherm under no stress.an ectotherm under no stress.
Amount of energy to maintain each gram of body Amount of energy to maintain each gram of body weight is inversely proportional to body size.weight is inversely proportional to body size.
Due to greater Due to greater surfacesurface to volume ratio in smaller to volume ratio in smaller animals.animals.
Dissipate heat much more rapidly.Dissipate heat much more rapidly.
Ghost Crab on a Treadmill