Keratinocytes and melanocytes are derived from the ectoderm. Merkel cells originate from the neural crest.
T/T
T/F
F/T
F/F
A mutation in tyrosinase can lead to albinism. Faster degradation of melanin is what causes fair skin.
Which of the following is false?
Keratohyalin granules contain active filaggrin
Birbeck granules might be involved in antigen elaboration
Melanosomes are degraded by keratinocytes
The keratohyalin granules can be found in the stratum granulosum
The birbeck granules can be found in Langerhan's cells
The stratum lucidum is called this because the cells are almost transparent as the nucleus is disappearing. The stratum lucidum and granulosum are more defined in thin skin than they are in thick skin.
Merocrine secretion is seen in glands are associated with the hair follicle. Sweat glands engage in merocrine secretion.
Which of the following is incorrectly matched
Mammary gland... apocrine
Apocrine gland of hair follicles... merocrine
Eccrine gland... apocrine
Sebaceous gland...holocrine
Salivary glands... merocrine
Adrenergic stimulation is related to thermoregulatory activity of sweat glands. Emotional stimulation is cholinergic.
The secretory coils are found in the hypodermis. The clear part secretes the watery component of sweat and the dark cells secrete protein content.
Arrector pilli muscles associated with hair follicles are under involuntary control via the cortex. The hair cuticle is part of the external root sheath layer
Which of the following is incorrectly matched?
Free nerve- pressure
Merkel disc- touch
Pacinian Corpuscle- pressure
Meissner- touch
Ruffini- heat sensation
Papillary dermis is directly attached to the dermis, has looped capillaries, and supplies the epidermis. Reticular dermis is made of dense irregular tissues, elastic fibers, and glands.
