Bio 235 chapter 5 integumentary Flashcards
(16 cards)
Functions of the Integumentary System
- Regulates body temperature.
- Detects cutaneous sensations.
- Stores blood.
- Excretes and absorbs substances.
- Protects body from external environment
- Synthesizes vitamin D.
The integumentary system is composed of…
the skin, hair, oil and sweat glands, nails, and sensory receptors.
Also known as cutaneous membrane
Skin
covers the external surface of the body and is the largest organ of the body in weight.
Skin
The superficial, thinner portion, which is composed of epithelial tissue; avascular
epidermis
deeper, thicker connective tissue portion; vascular
Dermis
Deep to the dermis, but not part of the skin
Subcutaneous layer
Also called hypodermis
Subcutaneous layer
Nerve endings that are sensitive to pressure. Found mostly in subcutaneous layer and sometimes the dermis
lamellated corpuscles or pacinian corpuscles
develop from the ectoderm of a devel- oping embryo and produce the pigment melanin. Their long, slender projections extend between the keratinocytes and transfer melanin granules to them
Melanocytes
Is a yellow- red or brown-black pigment that contributes to skin color and ab- sorbs damaging ultraviolet (UV) light
Melanin
Function of melanin
protects DNA of keratinocytes from the damaging effects of UV light.
arise from red bone marrow and migrate to the epidermis, where they constitute a small fraction of the epidermal cells.
Intraepidermal macrophages or Langerhans cells
They participate in immune responses mounted against mi-
crobes that invade the skin, and are easily damaged by UV light.
Intraepidermal macrophages or Langerhans cells
Their role in the immune response is to help other cells of the immune system recognize an invading microbe and destroy it.
Intraepidermal macrophages or Langerhans cells
