36) The study of tissues is termed: A. cytology B. histology C. embryology D. en

Question

36) The study of tissues is termed: A. cytology B. histology C. embryology D. endocrinology E. none of these choices are correct 37) A cell produces a secretion and releases it by rupturing a portion of its plasmalemma. Following this event the cell repairs its membrane. This cell may be describes as: A. holocrine B. apocrine C. merocrine D. endocrine E. none of these choices are correct 38) Which of the following is the proper sequence of epidermal layering. going from the underlying strata to the surface? A. corneum, granulosum, lucidum, basale, spinosum B. basale, spinosum, granulosum, lucidum, corneum C. comeum, lucidum, granulosum, spinosum, basale D. basale, granulosum, spinosum, corneum, lucidum

Explanation / Answer

36) The study of tissues is called as Histology. 'Hist' is a greek word which means 'tissue'.

37) A cell produces a secretion and releases it by rupturing a portion of its plasmalemma. Following this event, the cell repairs its membrane. This cell may be described as Apocrine.

In Apocrine mode of secretion, the apical portion of the cell gets pinched off and enters lumen. Secretion occurs when secretory materials are released from the cell along with some loss of cytoplasm. After this process, the cells are repaired.

Example for Apocrine glands are mammary glands.

Apocrine glands are less damaging than Holocrine and more damaging than merocrine.

38) The order of epidermal layering going from deepest layer to surface is: Option B

Stratum Basale (Germinal layer)- Composed mainly of Keratinocytes attached to the basement membrane. Seperates epidermis from dermis.

Stratum spinosum (spinous layer)- Keratinocytes are connected through desmosomes and starts producing lamellar bodies. Rich in polar lipids, glycosphingolipids, free sterols, phospholipids and catabolic enzymes

Stratum granulosum (granular layer): Keratinocytes appear to be granular because of the loss of their nuclei and cytoplasm. Lipids contained in keratinocytes released in to extracellular space to form a barrier.

Stratum lucidum (translucent layer): The thick skin in palms and soles is because of this layer. In other regions, there are only 4 layers except this layer.

Stratum corneum (cornified layer): Composed of anucleated corneocytes( final differentiation of keratinocytes) surrounded by protein envelope, filled with water retaining keratin proteins and surrounded by the extracellular layers of lipids.

PS: If any clarification needed, please post in comments. Happy to help!

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