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Which statement/s is/are correct about islets of Langerhans in pancreas?

They are of embryonic ectodermal origin, which distinguishes them from the entodermal exocrine part of the pancreas.

B-cells are the most numerous, making up 60-80% of cells.

Glucagon-producing A-cells tend to be on the periphery of the islets.

B-cells produce insulin.

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Which statement/s is/are correct about tooth?

Dentin contains type I collagen fibrils and hydroxyapatite crystals.

Cementum covers the root of the tooth.

Periodontal ligaments have a rapid turnover of proteins, therefore their condition may change, e.g. in connective tissue metabolism disorders.

After the tooth eruption is completed, new dentin is no longer formed.

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Which statement/s is/are correct about large intestine?

Its mucosa contributes significantly to water absorption.

It is lined with a simple columnar epithelium.

The external longitudinal muscular layer of the tunica muscularis externa forms three taeniae coli.

The mucosa creates villi, which increase the resorption surface.

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Which statement/s is/are correct about liver?

In the classical hepatic lobule, the hepatocytes are arranged radially between the portal areas towards the central vein.

Central vein is in the middle of the classical morphological hepatic lobules.

Hepatic sinusoids do not have a continuous lamina basalis.

Perisinusoidal space of Disse separates the endothelium of sinusoids from the vascular surface of hepatocytes.

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has serous glandulae oesophageales in the submucosa.

has tunica muscularis externa that is composed of smooth muscle throughout the esophagus.

is covered mostly with adventitia, only in the abdominal cavity is serosa.

has a wall composed of 4 basic layers: mucosa, submucosa, muscle and adventitia (or serosa).

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Sublingual gland

contains serous demilune of Gianuzzi.

has the longest main duct of all the major salivary glands.

is mostly serous.

is a simple tubular.

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Which statement/s is/are

correct about duodenum?

M (microfold) cells overlap lymphoid follicles.

Paneth cells contain eosinophilic granules.

Enterocytes have microvilli on their surface.

The lining consists of a simple columnar epithelium with goblet cells.

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Which statement/s is/are correct about salivary glands?

Saliva contains lysozyme with antibacterial activity.

Saliva dissolves substances that stimulate the taste buds.

Serous cells form the secretory component of IgA.

The secretion of serous cells contains proteins.

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contains numerous lymphoid nodules.

is a part of the cecum and shares with it the histological structure of the large intestine.

the individual taenia of the outer longitudinal muscle layer fuse here.

its mucosa is lined with simple columnar epithelium with numerous goblet cells.

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