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their activity is facilitated by opsonisation of foreign particles.

can respond to chemotactic stimuli.

are capable of activation.

do not have lysosomes.

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arise from the differentiation of helper T lymphocytes.

produce antibodies (immunoglobulins).

in their nucleus alternate heterochromatin and euchromatin.

are effector cells of specific humoral immunity.

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can be unilocular or multilocular.

accumulate and release triacylglycerols.

have a nucleus in the centre of the cell.

most of the cell is filled with a large vacuole containing storage polysaccharides.

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Connective tissues

have a mesenchymal origin.

create in the form of loose connective tissue, e.g. lamina propria mucosae.

contain only extracellular fibres, not amorphous ground substance.

include connective tissue proper, cartilage, muscle and bone.

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Which statement/s is/are

correct about amorphous (ground) substance of the extracellular matrix of the connective tissue?

It is based on glycosaminoglycans and structural glycoproteins.

Fibronectin and laminin are sulfated glycosaminoglycans.

It contains a minimum of water due to its hydrophobic properties.

Hyaluronic acid is an unsulfated glycosaminoglycan.

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is secreted e.g. by fibroblasts or smooth muscle cells.

is more easily digested by normal proteases than collagen.

elastic fibres are composed of elastin surrounded by oxytalane microfibrils.

is composed of linear molecules without cross-links, so elastin fibres do not branch.

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Reticular tissue

forms the stroma of the hematopoietic bone marrow.

forms the fibrous capsule (capsula fibrosa) of the spleen, kidney, and liver.

its reticular cells produce and envelop the reticular fibers with their processes.

usually contains no phagocytic cells.

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Which statement/s is/are correct about collagen?

Collagen fibres are basophilic.

Tropocollagen molecules aggregate into microfibrils which form fibrils.

Tropocollagen is formed by a double helix of two polypeptide chains.

It contains abundant amino acids glycine and proline (or hydroxyproline).

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Melanocytes (pigment cells)

form melanosomes with a group of tyrosine-derived pigments.

have long processes.

are ontogenetically derived from the intestinal endoderm.

release melanin granules in the epidermis into the surrounding keratinocytes.

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Reticular fibres

do not stain when impregnated with silver.

consist mainly of type IV collagen.

are in the connective tissue of the bone marrow.

are surrounded by smooth muscle cells in the arterial wall.

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