BioL121 Tissue Lab Quiz (copy)

Frog Skin:

stratified squamous epithelium

• many layers of epidermis

Lung (Human):

simple squamous epithelium

• thin layer of epidermis (one singular layer)

• has “holes” of empty space

Duodenum:

columnar epithelium

• elongated cells

Skin Tissue: Hair Follicle:

follicle and hair bulb

Skin Tissues: Sole of Foot:

stratified squamous epithelium

thick layer of epidermis (darker than dermis because it is a thick layer of DEAD skin cells)

Skin Tissues: Footpad Squirrel:

stratified squamous epithelium

thin layer of epidermis and many cells

• very similar to the human sole of foot, just fewer dead skin cells → making a thinner epidermis layer

Connective Tissues: Areolar Tissue:

Loose fibrous connective tissue

stringy fibers

• dark think “strings” = elastic fibers

• thick lighter “strings” = collagen fibers

Connective Tissues: Bone Tissue:

black and white; arranged in circled format

• osteocyte (in lacuna) = dark dashes around Haversian Canal

• Haversian Canal = whiteish circles/blank spaces in the middle of an osteon

• Osteon = the entire group of the haversian canal surrounded by all the osteocytes

• Canaliculi = hair-like cracks that are near osteocyte

• Ossified Matrix = white space between osteons

Connective Tissues: Adipose Tissue:

empty spaces → plasma membrane is what stained rather than the actual cell

• emptier than the lung tissue

Connective Tissues: Cartilage:

thin strip with many circles/holes

• Chondrocyte = dark “cell-like” shape inside lacuna

• Lacuna = small little “ball-like” structures w/dark spots inside

• Matrix = empty space surrounding lacuna

Nervous Tissue:

• Neurons = bigger blobs w/tentacle-like arms

• Glial cells = small little “dots”

• Axons = transmits signal away from neuron

• Dendrites = receives signals toward the cell

Impossible to tell which of the arms are axons or dendrites without context

Skeletal Muscle Tissues:

VOLUNTARY MUSCLE

• many tightly packed rows of squiggly lines of cells

• darker in color (purplish)

• tube-like format

• very coarse and rough looking

Cardiac Muscle Tissues:

• Branched tubular fibers

• Less rows w/more purplish cells

• Muscle fibers are more visible (pink in color)

Smooth Muscle Tissues:

INVOLUNTARY MUSCLE

• Thick layer on edge of skin

• Looks similar to cardiac muscle in formatting

• Has squiggly lines of purplish color