(2)

(3)

Unicellular glandular epithelium consists of isolated glandular cells, e.g., goblet cells (mucous cells) of the alimentary canal. Compound epithelium is made of more than one layer (multi-layered) of cells. It covers the dry surface of the skin, the moist surface of the buccal cavity, pharynx, inner lining of ducts of salivary glands, and pancreatic ducts. Multicellular glandular epithelium consists of a cluster of cells, e.g., salivary glands. Endocrine glands are commonly called ductless glands as they lack draining ducts, e.g., thyroid, pancreas, pituitary, etc.

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(3)

Goblet cells of the alimentary canal are unicellular glands consisting of isolated glandular cells. Earwax is the secretion of an exocrine gland, which is secreted through ducts or tubes.

(4)

Ligaments are dense regular connective tissue. Cartilage, bones, and blood are types of specialized connective tissue.

(1)

Mast cells → Areolar connective tissue

Inner surface of bronchiole → Ciliated epithelium

Blood → Specialised connective tissue

Tubular parts of nephron → Cuboidal epithelium

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Neuroglia, also called glial cells which constitute the rest of neural system protect and support neurons.

(2)

Cartilage is present in the tip of nose, outer ear, joints, between adjacent bones of the vertebral column, limbs, and hands in adults.

(1)

Bronchioles → Ciliated epithelium

Goblet cell → Glandular tissue

Tendons → Dense regular connective tissue

Adipose Tissue → Loose connective tissue

(4)

Intercalated discs are present in cardiac muscle that communicate at some fusion points and allow the cells to contract as a unit.

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Tight junctions help to stop substances from leaking across a tissue. Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules, and certain big molecules.

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The cuboidal epithelium is composed of a single layer of cube-like cells, which is commonly found in ducts of glands and tubular parts of nephrons in kidneys, and its main functions are secretion and absorption. The epithelium of the proximal convoluted tubule (PCT) of the nephron in the kidney has microvilli.

(2)

Certain cells of columnar epithelial cells contain mucous and are called goblet cells as they look like goblets. Such cells are present in the alimentary canal.

(1)

(3)

(1)

Smooth muscle fibers are elongated and spindle-shaped (fusiform). Each fiber contains a single oval nucleus surrounded by cytoplasm (sarcoplasm). In cytoplasm, myofibrils are arranged longitudinally. These fibers lack striations and sarcolemma. However, they are enclosed by the plasma membrane.

(3)

Tip of nose has elastic cartilage. Simple columnar epithelium lines the stomach. Tendon is white fibrous connective tissues. Posterior part of intestine has single-unit smooth muscle in which all fibers of muscle contract simultaneously as single unit.

(4)

Most cells in animal tissues (with the exception of a few terminally differentiated cells such as skeletal muscle cells and blood cells) are in communication with their adjoining cells via gap junctions. At the place where a gap junction is present, membranes of two adjacent cells are separated by a uniform narrow gap of about 2–4 nm. The gap is spanned by channel-forming proteins called connexins, which allow inorganic ions and other small water-soluble molecules to pass directly from the cytoplasm of one cell to the cytoplasm of the other cell.

(3)

Areolar tissue is the most widely distributed loose connective tissue in the body. Tendon is a type of dense connective tissue, adipose tissue is a fat-storing loose connective tissue and cartilage is a specialized connective tissue.

(3)

Inner lining of salivary ducts - Simple cuboidal epithelium

Moist surface of buccal cavity - Non-keratinized stratified squamous epithelium

Inner surface of bronchioles - Ciliated columnar epithelium