Skin & Lymphatic System Flashcards
What are the layers of skin?
Epidermis, dermis, hypodermis (subcutaneous layer).
What does the dermis consist of?
Made up of collagen, elastin and fibrillin. This gives it flexibility and strength. Also has nerve endings, sweat glands, oil glands, hair follicles and blood vessels.
What does the epidermis consist of?
- Keratinocyte cells
- Stratum corneum (acts as a barrier)
- Melanocyte cells (melanin- skin colour)
- Langerhans cells (skins immune system)
What does the subcutaneous layer consist of?
Layer of fat that helps insulates the body. Provides a protective padding and stores energy.
What are the main functions of the skin?
- Protection
- Temperature maintenance
- Synthesis and storage of nutrients
- Sensory reception (nerve endings to detect)
- Excretion and secretion
What are the four stages of skin healing?
- Inflammation
- Scab formation
- Cell division and migration
- Scar formation
Define lymphatic system.
Cells, tissues and organs that play a central role in the body’s defence against pathogens.
What are the functions of the lymphatic system?
- Removes interstitial fluid from tissues.
- Absorbs and transports fatty acids and fats from DS.
- Transports white blood cells to and from the lymph nodes into the bones.
Where does lymph empty into?
Thoracic duct and right lymphatic duct.
What are leukocytes?
White blood cells that protects the body against infectious disease and foreign invaders.
Where are leukocytes produced and derived from?
The bone marrow as stem cells (hematopoietic stem cell).
What are the two classifications of white blood cells?
Myeloid leukocytes and lymphocytes.
What are the three classes of lymphocytes?
T cells, B cells, NK cells.
Where are lymphocytes produced and stored?
Tonsils, spleen, thymus and bone marrow (red).
Function of lymph nodes.
Monitor and filter lymph, remove antigens, initiate immune response.
