Bio Skin

Question 1

Cell cell junctions types

Answer 1

Structures that attach adjacent cells to one another
1) desmosomes provides tensile strength to epithelial cell sheets by anchoring the cytoskeletons specifically the intermediate filament of two cells together. Found in muscle tissue, epithelium layers of skin.
2) gap junctions - mediate communication between cells in muscles, provide cytoplasmic continuity
3) tight junctions - prevent water and solutes from diffusing between cells and across the epithelium cell layer. Seal off extracellular pathways requiring passage through highly selective cell membranes
4) adherens junctions - stabilize the cells but not effect on selective transport

Question 2

Cell types

Answer 2

Endocrine - produce hormones
Exocrine - secretes substances like enzymes, sweat, saliva
Paracrine - secrete substance to effect neighboring cells
Autocrine - releases a hormone that proceeds to bind a receptor on the same cell to induce changes

Question 3

Exocrine glands in the dermis are?

Answer 3

Sweat glands secrete sweat that contributes to thermoregulation
Sebaceous glands (сальные) secretes sebum, oil containing substance that helps prevent water loss from the skin and hair

Question 4

Thermoregulation

Answer 4

Increase body T -> vasodilation and sweat -> decrease body T

Decrease body T -> vasoconstriction and shivering -> increase of body T

Question 5

Sensory receptors of the skin

Answer 5

Question 6

Skin functions

Answer 6

Protections from UV radiation
Hair growth
Sweet

Epidermis- barrier
Derma- blood vessels, immune cells, sensory receptors , hair follicles, sweat and oil glands, strength and flexibility of the skin
Insulation and shock absorbing adipose tissue only in hypodermis, protects internal organs

Question 7

What hormone released sweat?

Answer 7

Epinephrine

Question 8

What layer of skin prevent water loss?

Answer 8

Stratum corneum in epidermis