Tissues, Organs, and Homeostasis Flashcards Preview

HSCI100 > Tissues, Organs, and Homeostasis > Flashcards

Flashcards in Tissues, Organs, and Homeostasis Deck (15):
1

organ

2(+) tissue types working together

system: combo of organs working together

2

integumentary system

- skin + accessory organs (hair, nails, glands)
- important for maintaining homeostasis

3

skin layers/regions

2 main regions: epidermis and dermis
- subcutaneous layer: under skin, between dermis and internal structures, fat storage

4

integumentary functions

- protection (pathogen invasion, physical harm, water loss)
- regulate body temp
- sensory receptors
- synthesizes chemicals (melanin, vitamin D)

5

epidermis

- thin, outermost layer of skin
- epithelial tissue (stratified squamous)
- uppermost dead cells filled w/keratin (waterproof barrier)

6

langerhans cells and melanocytes

epidermis;
l: macrophage white blood cell
m: produce melanin for protection against UV light

7

homeostasis

ability to maintain a constant internal environment in the body

8

skin cancer in epidermis

basal cell carcinoma (most common, least deadly)
melanoma (least common, most deadly)

9

dermis

thick inner layer, dense fibrous connective tissue, elastic collagen fibers, blood vessels provide nutrients, sensory receptors, glands

10

nails

protective covering

11

hair follicles

dermis, hair grows from epidermal cells

12

oil glands

hair, produces sebum, lubrication of hair and skin

13

sweat glands

dermis, regulate body temp

14

homeostasis: negative feedback

stimulus -> sensor -> control center -> effect -> return to normal

eg thermoregulation

15

homeostasis: positive feedback

eg birth: secretion of oxytocin -> uterine contractions -> loops