S3: Body Anatomy And Disease Resistance

Question 1

What are the three layers of skin?

Answer 1

1. Epidermis
2. Dermis
3. Underlying layer of subcutaneous tissue (hypodermis)

Question 2

What are the two layers of epidermis skin?

Answer 2

1. Stratum corneum
2. Stratum germinativum

Question 3

What is the stratum corneum?

Answer 3

A superficial, non-vascular, cornified layer that is constantly being shed and replaced

Question 4

What is the stratum germinativum?

Answer 4

An actively growing layer, below the stratum corneum in the epidermis. Melanocytes, which produce melanin, are found in this layer.

Question 5

What is the dermis?

Answer 5

Below the epidermis, contains arteries, veins, capillaries, lymphatics, and nerve fibres

Question 6

What is the hypodermis?

Answer 6

A subcutaneous layer below the dermis that consists of connective and adipose tissue

Question 7

What are the three integumentary system functions?

Answer 7

1. Provide a protective barrier for the body
2. A sense organ (touch and feeling)
3. A site for vitamin D synthesis

Question 8

What is keratin?

Answer 8

A protein in the skin that acts as a waterproofing agent and a barrier against bacteria

Question 9

What is the normal, ideal pH of the skin and what keeps is that way?

Answer 9

The normal pH of the skin is between 3-4 (acidic). Fatty acids work to keep it that way

Question 10

What is epithelial?

Answer 10

The type of tissue that line the internal passageways that open to the exterior

Question 11

What are the three shapes of a epithelial cells?

Answer 11

1. Cube (cuboidal)
2. Column (columnar)
3. Elongated and flattened (squamous)

Question 12

What is lysozyme?

Answer 12

An enzyme in tears that destroys certain types of bacteria