Cells & Tissues

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Cells & Tissues

description

Cells & Tissues. Elements-diversity. Cell structure predicts function . -cells contain the same elements -organelle amplification gives function. Factors that influence cell specialization in animals. Cytoplasm Environment Neighbouring cells Genes. Elements-diversity. Tissues: - PowerPoint PPT Presentation

Transcript of Cells & Tissues

Page 1: Cells & Tissues

Cells & Tissues

Page 2: Cells & Tissues

Elements-diversity

Cell structure predicts function

-cells contain the same elements

-organelle amplification gives function

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Factors that influence cell specialization in animals

• Cytoplasm

• Environment

• Neighbouring cells

• Genes

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Elements-diversity

Cell structure predicts function

cells live in communities =TISSUES

Tissues:EpitheliaConnective TissueMuscleNerve

4 types of tissues

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Epithelial Functions

protection

absorption

secretion

transport

barrier

Epithelia-functions

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Muscle Tissue Functions

Muscle Tissue-functions

Contraction (force generation)-movement -structural support-glands-physiology

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Skeletal Muscle-muscle fibers (cells)

-long cells (35 cm) -multinucleate

-in longitudinal section-long -striated-peripheral nuclei-unbranched

Muscle Tissue-types-skeletal

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Smooth muscle-unstriated-central nucleus-appears smooth-central elongate nucleus-concentric layers

-can be very thick-extended contraction

-digestive system-blood vessels-uterus

Muscle Tissue-types-smooth muscle

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Cardiac Muscle

-striated muscle-branched fibers-1-2 nuclei/cell (square/central)-intercalated disks-highly vascularized

Muscle Tissue-types-cardiac muscle

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Myotonia Congenita

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Nerve Tissue-functions

Nervous Tissue Functions

communication (signal conduction)-inter-cellular chemical-intra-cellular electrical-arranged in networks

-sensory-motor

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Nerve Tissue-neurons

Neurons-size, shape highly variable, asymmetric

-dendrites = input (afferent)

-axon = output (nerve fiber) (efferent)

-cell bodies found in nervous tissue

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Blood Functions

- transport-gases (O2, CO2)

-nutrients-cells (leukocytes)-hormones

- wound healing-clot formation-remodeling (scar)

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Connective Tissue Functions

Connective Tissue-functions

Maintain boundaries

Structural support

Cell adhesion and movement

Protection

Molecular exchange

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Connective Tissue-types

Adipose connective tissue

-each cell single fat vacuole-white fat-fat fat-energy storage

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Skeletal system-bone structure

Bone