5 from where do the cells of the epidermis obtain oxygen and nutrients? a From b

Question

5 from where do the cells of the epidermis obtain oxygen and nutrients? a From blood vessels in the epiderms vessels in the dermis c son hom the ar d From blood vessels in other epitheial tissues 6 Matching Match the following teems with the correct description Papillary layer Sebaceous gland Lamelated corpuscle Hair follicle A. Secrete product theough a pore B. Pressure receptor in the dermis C. Projections of the dermis that indent the epidermis D Superficial layer of the dermis, loose connective tissue E. Sheath of epitheial and connective tissue around a hair E Deep layer of the dermis, dense irregular collagenous connective tissue G. Secretes sebum (o H. Portion of the hair that projects from the skins surface Dermal papillae Hair shaft Reticular layer Sweat gland 7 Which of the following are characteristics of thin skin? (Circle all that apply) a. Located over the palms and the soles of the feet. b. Contains hair and arrector pili muscles c Contains sweut glands d Very thick stratum corneum e. Contains sebaceous glands f Contains a stratum lucidum. 8 TruelFalse Mark the following questions as true (T) or false (F). If the question is false, correct it to make it a true statement a An arrector pil muscle is composed of skeletal muscle tissue b. The dividing cells of a nal are located in the eponychium. C. Both hairs and nails are composed primanly of dead keratinocytes d. A hair folicle is composed of epithelium and connective tissue 9Fill in the blanks corpuscles in the dermis detect pressure, whereas corpuscles in the dermis detect fine touch. 10 Eccrine sweat is released into a , and sebum is released into a a a duct, a hair follicle b. a hair folile, a blood vessel. c a duct, a blood vessel. d a hair follicle, a duct 150 Evole

Explanation / Answer

Answer 5:- Option b

Explanation:- The skin is composed of epidermis and underlying layer of dermis. The epidermis is the epithelial tissue while the dermis is the connective tissue. The dermis has adequate blood supply through blood vessels. This blood carries oxygen and nutrients, which nourish dermis and also diffuse to nourish the epidermis.

Answer 6:-

Papillary layer :– Option D

Papillary layer is the layer of skin between the epidermis and subcutaneous tissues. The papillary layer is made up of connective tissue.

Sebaceous gland :- Option G

Sebaceous gland secretes sebum which is an oily substance. The sebaceous glands are located at the base of hair follicles. The function of the sebum is to keep skin moist.

Lamellated corpuscle :- Option B

These are mechanoreceptors located in the skin. The mechanoreceptors are the pressure receptor, which sense difference in the pressure and send the appropriate signal to the brain. The lamellated corpuscles are present in the dermis of the skin.

Hair follicle :- Option E

Every hair has a live follicle with roots that originates from the fatty layer called subcutaneous tissue. The hair follicle is made up of sheath of cells and connective tissue that surrounds the root of the hair.

Dermal pappilae :- Option C

These are small nipple like extensions of the dermis that connects into the epidermis. Thus these are projections of dermis that indent the epidermis.

Hair shaft:- Option H

Hair shaft is the visible portion of the hair that projects out of the epidermal layer. The hair shaft is made of keratin protein.

Reticular layer :- Option F

The reticular layer is present below the papillary dermis. It is composed of dense irregular collagenous connective tissue.

Sweat gland :- Option A

Swaet glands produce sweat that is important in maintaining body’s temperature. The sweat gland produces sweat that is brought to the body surface through the pores.

Answer 7:- Options B,C,and E

The thin skin consists of four strata levels of epidermis – Stratum basale, stratum spinosum, stratum granulosum and stratum corneum. The stratum lucidum is absent in thin skin. Stratum lucidum which contains flat keratin fibres is present in thick skins of palms and soles. The very thick stratum corneum develops also in the region of thick skin. Thus, options A, D and F are not correct answers.

Thin skin contains hair, sebaceous glands, sweat glands and the only absent layer is stratum lucidum.

Answer 8:-

A – False

Arrector pilli muscle is composed of band of smooth muscle and not that of skeletal muscle tissue.

B –False

Eponychium is the thick of skin surrounding fingernails and toenails. It is also known as nail fold. The dividing cells of nail are located in nail matrix and not the eponychium.

C- False

Hair and nail are composed of protein called keratin which is produced by keratinocytes. The dead keratinocytes do not make up hair and nail.

D- True

Hair follicle is composed of sheath of epithelial cells and connective tissue.

Answer 9:-

Lamellated corpuscles in the dermis detect pressure and tactile corpuscles in the dermis detect fine touch.

Answer 10:- Option a

Explanation:- Seat is released by the sweat glands in to the duct and then through the pore on the surface of the skin, whereas sebaceous glands secrete sebum that is released through hair follicle.

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