Lecture 1 Skin Flashcards
Skin takes up ____% of our body weight
60%
The epidermis
a. Contains mainly keratinocytes
b. Contains protein fibers for strength.
c. Is avascular
d. Both and C
D. The outer layer of your skin must be avascular otherwise you would be bleeding all the time.
Which of the following statements is true
- Moles are caused by melanocytes overproducing melaosomes
- Vitamin D is essential for strong bones and normal calcium metabolism
- Malignant melanomas are common but relatively benign.
- Epidermal sebum levels increase with age.
2.
What four tissue types is skin made up of?
Epithelial, connective, muscle and nervous
What are the 3 primary layers of the skin?
Epidermis, dermis and hypodermis.
Name 2 key features of the dermis
Avascular, has protein fibres for strenght
What is the hypodermis made out of?
Adipocytes and adipose tissue
The cutaneous membrane consist of the _______ and ______
Epidermis, demis
The subcutaneous layer consists of?
The hypodermis
Which of the following statements is FALSE?
A. Arrector pili muscles attach hair follicles to the upper dermis
B. Free nerve endings mainly respond to pain and temperature
C. There is a “one-receptor - one function” relationship
D. Hyperkalaemia (increased extracellular K+) is a potential consequence of a severe burn.
C. Receptors can sense more than one stimuli, they are just more specific to others.
Which of the following statements is FALSE?
A. Arrector pili muscles attach hair follicles to the upper dermis
B. Free nerve endings mainly respond to pain and temperature
C. There is a “one-receptor - one function” relationship
D. Hyperkalaemia (increased extracellular K+) is a potential consequence of a severe burn.
C. Receptors can sense more than one stimuli, they are just more specific to others.
Which of the following is TRUE??
a. Precapillary sphincters are innervated by the SNS
b. Lamellar corpuscles mainly sense discriminative touch
c. Eccrine sweat glands are only found in the palms
d. The hypodermis contains a stratified epithelial barrier.
A
What accessory skin structure is responsible for enhancing sensation? A. Apocrine glands B. Sebaceous glands C. Nails D. Epithelial squamous stratification.
C.
The stratum cornum can be referred to as which of the following? A. Ganular Layer B. Arousl layer C. Excitement layer D. Horny layer
D
The stratum spinulosm
A. Contains tall columnar regenerative cells
B. Contains dead dried-oout cells without nuclei
C. Contains intercellular desmesomes
D. Contains subcutaneous epithelium
C. Contains intercellular desmesomes
Which skin receptor is most ideal for sensing texture, shape and edges? A. Lamellar (Pacinian) corpuscles B. Tactile (Merkel) discs C. Tactile (Meissner) corpuscles D. Bulbous corpuscles
B
Aprocrine swear glands:
A. Are limited and can be found in the groin
B. Are mainly controlled by hormones
C. Are mainly controlled by the nervous system
D. Both A and B
D
What two layers does the dermis consist of?
The papillary and reticular layer.
What is the papillary layer of the dermis made up of?
Contains areolar tissue
What does the reticular layer consist of?
Dense irregular connective tissue (elastin and collagen)
Where are melonocytes located?
In the basale layer of the epidermis
What happens to the skin when you age?
- Drier and thinner dermis
- Less sebum
- Slower skin repair.
- Reduced collagen
What are the layers of the epidermis from the most superficial to the bottom?
- Stratum corneum
- Stratum lucidum
- Stratum granulosm
- Stratum spinosum
- Stratum basale
What is arrector pili muscle?
Smooth muscle innervated by the SNS alpha 1 receptors. They attach hair follicles to the upper dermis. Contraction of the hair pull hair upright and dimples the skin.
