Animal Cells and Tissues

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Transcript of Animal Cells and Tissues

ANIMAL CELL SHAPES

1.

squamous irregular shape, e.g. cheek cells

2. 3.

disc-shaped coin-like, flattened circles, e.g. mammalian red blood cells spherical/globular e.g. fat globules

4.

oval e.g. amphibian red blood cells

5.

cuboidal e.g. kidney epithelial cells

6.

columnar tall and rectangular , e.g. epithelial cells lining villi

7.

threadlike e.g. sperm cells

8.

cylindrical e.g. skeletal muscle cells fusiform elongated, oval cells with tapered ends, e.g. smooth muscle cells stellate branching, assumes a star-like shape, e.g. neurons

9.

10.

ANIMAL TISSUES

EPITHELIAL TISSUE serves as body coverings covers external body parts lines internal tubes and cavities functions protection secretion excretion lubrication sensory reception reproduction

ORGANIZATION OF EPITHELIAL TISSUES

CONNECTIVE TISSUE scattered cells in a matrix HAS MANY DIFFERENT TYPES 1. connective tissue proper (CTP) dense CTP tendons attach muscles to bone ligament attach bone to bone

loose CTP covers the muscles

adipose tissue stores energy in the form of fat

CONNECTIVE TISSUE PROPER

PHOTOMICROGRAPH OF DENSE CTP

PHOTOMICROGRAPH OF DENSE CTP

2. cartilage composed of cells (chondrocytes) embedded in a tough but flexible matrix matrix contains collagen for support serves as the precursor to bone e.g. nose and ears

matrix

lacuna

chondrocyte

PHOTOMICROGRAPH OF CARTILAGE (x.s.)

3. bone composed of cells (osteocytes) embedded in a hard matrix matrix contains calcium phosphate for support and protection of internal organs

PHOTOMICROGRAPH OF BONE (x.s.)

4. vascularcomposed of blood and lymph blood transports various substances like oxygen, nutrients and hormones all over the body for immunity lymph maintains aqueous condition inside the body

PHOTOMICROGRAPH OF BLOOD

MUSCULAR TISSUE composed of muscle fibres (protein) TYPES 1. skeletal muscles attached to bones for voluntary/conscious movements striated or banded

2. smooth muscles for involuntary/unconscious movements not striated or banded

3. cardiac muscle the heart pumps blood all over the body striated/banded involuntary/unconscious

HUMAN MUSCLE TYPES

PHOTOMICROGRAPH OF SKELETAL MUSCLE

PHOTOMICROGRAPH OF SMOOTH MUSCLE

PHOTOMICROGRAPH OF CARDIAC MUSCLE

MUSCULAR MOVEMENT

THE SLIDING FILAMENT MODEL

NERVOUS TISSUE composed of neurons (nerve cells)

Photomicrograph of nervous tissue

Photomicrograph of a neuron

epineurium fascicle

perineurium

NERVE X.S.

germinal epithelium follicle loose connective tissue

CAT OVARY X.S.

When describing slides, take note of the ff: colour

of the stain cell shape in tissues, describe the cells organization and arrangement identify all pertinent structures if possible, identify functions of labelled structures