HISTO QUIZ

Presence of transverse or cross-striations known as dark and light bands

No cross-striations but with longitudinal striations

Generally attached to the bone except for the intrinsic muscles of the tongue, upper esophagus and some of the facial expression muscles

Each cell is joined end to end by a surface specialization called intercalated discs Intercalated discs functions maintain firm cohesion of successive cellular units of the myocardium transmits the pull of one contractile unit to the next cellular unit along the long axis of the myofibrils

Capable of slow, sustained, resistant to fatigue contraction

The dense CT surrounding the whole muscle

The thin septa that extend to surround each fascicle

The delicate reticulum surrounding individual fibers

Structural and functional unit of the skeletal muscle

Free ends are attached to the Z-line, then towards the A-band up to the edge of the H- zone

For slow, continuous contraction for prolonged periods such as postural muscles at the back

For rapid contraction and short burst of activity such as in athletes

Modified cardiac muscle fibers that are specialized for impulse conduction

Skeletal Muscle are fusiform or spindle-shaped.

Sliding Filament Mechanism: A-band remains constant during relaxation and contraction

Contain stem cells, its proliferation is responsible for the continuous renewal of the epithelium

Prominent feature is the presence in the cytoplasm of numerous bundles of keratin

Consists of 3-5 layers of flattened polygonal cells

A layer of thin, translucent, lightly stained, refractile cells

Consists of 15-20 layers of flattened non-nucleated heavily keratinized cells

Specialized cells in the basal layer or in the underlying dermis

Star-shaped cells found mainly in the stratum spinosum

Cells resemble keratinocytes but have a small dense granules in the cytoplasm

Tough leathery layer of connective tissue that supports the epidermis and binds it to the subcutaneous tissue

Loose CT which anchors the skin to the underlying fascia or bone

Appendages of the skin: Keratinocytes, Sebaceous Glands, Hair, Nails except?

Muscle inserts into the CT sheath of hair follicle slightly above its midpoint

Appendages of the hair follicle located above the insertion of the arrector pili muscle

Coiled tubular glands located deep in the dermis

Formed by keratinization of epithelial cells in a nail matrix

Heart weight in normal adult males:

Endocardium, Pericardium, Myocardium, Epicardium. Which of the following does not belong to the group?

Corresponds to the visceral layer of the pericardium

Lined by endothelium supported by subendothelial layer of loose connective tissue

Variable amounts of elastic fibers, reticular fibers, proteoglycans and glycoproteins

Vasa Vasorum is more frequent in arteries than veins

Lumen is larger while wall is thinner

Less elastic fibers and more smooth muscles

Small endothelial tubes that connect arterioles to venules

Found in all types of muscles, CT, exocrine glands, nervous tissue

Found in kidneys, small intestine, choroid plexus, endocrine glands

Found in the liver, bone marrow and spleen, some endocrine glands

Lymphatic vessels are more variable with regards to its shape and caliber

Substances not recognized by immune system as self

Supporting framework of the organ

Glycoproteins that act as molecular signals between immune cells

Cellular portion of the organ

Stroma of reticular fibers and cells filled with lymphocytes, macrophages, some plasma cells

Circumscribed closely packed collections of lymphocytes within areas of diffuse lymphoid tissue

Broad, flat, pyramid-shaped, bilobed organ, well encapsulated

Aggregates of lymphoid tissue occurring in series along the course of lymphatic vessels

Largest among the lymphoid organs

Forms the periarterial lymphoid sheaths (PALS) around the arteries (central artery)

Consists of an elaborate network of tortuous, branching, and anastomosing venous sinuses

Partly covered by capsule and partly lined by epithelium which invaginates into the lymphoid tissue and form tonsillar crypts which are infiltrated with lymphocytes

Composed of glands whose products pass by way of blood vascular system to the other cells in the body, where it elicits a specific response

Medullary parenchymal cells are known as ____ which stores and secretes catecholamines (epinephrine or norepinephrine)

Secrete glucagon and are usually located peripherally

Produce insulin; the most numerous and are located centrally

Secretes somatostatin; are scattered and much less abundant