Lecture Week 6

Question 1

Dermis

Answer 1

Deep layer of the skin

Question 1

What are the tissues in the dermis?

Answer 1

Areolar - papillary layer
Dense Irregular Connective - reticular layer

Question 2

How thick is the dermis?

Answer 2

1-2mm thick

Question 3

Info about Dermis

Answer 3

Contain capillary loops and sensory receptors
highly vascular

Question 4

Hypodermis

Answer 4

Region below skin
areolar and adipose tissue, separates skin from underlying tissue

Question 5

What are sensory receptors responsible for?

Answer 5

Sense of touch, detecting pressure, etc.

Question 6

Integumentary System Accessory Organs

Answer 6

Hair Follicles, Sebaceous (Oil) glands, sweat glands

Question 7

Hair Follicles

Answer 7

Follicle wall formed from epidermal cells
usually associated with an arrector pili muscle

Question 8

Sebaceous (Oil) Glands

Answer 8

Holocrine glands that secrete sebum for lubrication, moisture, protection from bacterial infection

Question 9

Sweat Glands

Answer 9

2 types
Apocrine
Merocrine

Question 10

Apocrine

Answer 10

Mainly located in axillae and pubic region, secrete into hair follicles, holocrine glands with secretion that may only function in olfactory communication

Question 11

Merocrine

Answer 11

Found in most areas of skin - mainly forehead and middle of back
Secrete onto skin surface through sweat pore
Secretion functions in thermoregulation and protection from bacterial infection

Question 12

Skeletal System Organs

Answer 12

Bones and joints
-Each bone and joint is considered an organ because it consists of more than one type of tissue

Question 13

Organ

Answer 13

Number of tissues combined

Question 14

Functions of Skeletal System

Answer 14

Support, store minerals and lipids, produce blood cells, protection of body, leverage - allow for body movement

Question 15

Bone Classification by Shape (4)

Answer 15

Long - large limb bones
Short - Wrist and ankle bones
Flat - sternum and cranium bones
Irregular - vertebrae and facial bones

Question 16

Parts of a Long Bone

Answer 16

Diaphysis, Metaphysis, epiphysis
Articular cartilage - end of bone
Periosteum - covers outer surface
Medullary Cavity - one end of diaphysis to other
Endosteum - lines all internal cavities
Compact bone - diaphysis and surface of epiphyses
Spongy bone - cores of epiphyses and metaphyses
Marrow (2 types) - Red (blood cell production), yellow (adipose for energy storage)

Question 17

Osteoblast

Answer 17

Bone “creating” cell
performs matrix deposition (ossification, osteogenesis)

Question 18

Osteocyte

Answer 18

Mature bone cell in a lacuna

Question 19

Osteoclast

Answer 19

Bone “destroying” cell
performs matrix resorption
functions - bone remodeling during growth, matrix mineral utilization

Question 20

Osteon

Answer 20

central canal + concentric lamellae (matrix layers)

Question 21

Osteocytes live in lacunae

Answer 21

True

Question 22

Canaliculi connect neighboring lacunae by tunnels

Answer 22

True

Question 23

Lamellae

Answer 23

Layers around osteon

Question 24

Bone Tissue Structure - Spongy

Answer 24

Structural unit is trabeculae - small interconnecting bars or plates containing osteocytes in lacunae and lamellae