Anatomy- Unit 3 Part 2

Quiz Thursday

What functions does hair serve?

Protection from external microbes, dust and protection from UV rays. Provides heat regulation and aids in detecting touch.

What produces goosebumps?

The contraction of the Arrector Pili Muscle

Why does it hurt when pluck a hair but not when you have a haircut?

When you are plucking a hair you are affecting the hair root plexus; when you are getting a haircut, you are only cutting the hair shaft, which lacks nerve endings.

What gives hair its color?

The amount of melanin

Apocrine glands vs. Eccrine Glands

Apocrine Glands:

• Sudoriferous Gland

• Secrete through a hair follicle

• Do not function until puberty

• Activated during emotional stress and sexual excitement

• Responsible for cold sweats

• Abundant in the armpit, groin, and areolae of the breast.

Eccrine Glands:

• Sudoriferous Gland

• Helps regulate body temp

• Secrete through a pore

• Small role in eliminating wastes

• Abundant in the palms, soles, and forehead.

Why are nails so hard?

Tightly packed keratinized epidermal cells

What are the function of nails?

To protect and scratch

During wound healing, which epidermal strata can divide to produce lost strata?

Stratum Basale

How does inflammation help wound healing?

Eliminates microbes, removes foreign material, and removes dying tissue by clotting the blood.

Which tissue initially fills a deep wound?

Granulation tissue

What type of tissue does granulation tissue become?

Scar Tissue

What is fibrosis?

The process of scar formation

Why doesn’t epidermal wound healing result in fibrosis?

avascular

What do sebaceous glands secrete?

Sebum

What is the main function of sebaceous glands?

Lubricate and waterproof the skin and hair

Where are eccrine sweat glands most numerous?

Palms and soles

What are nails composed of?

Hard Keratin

What occurs first during wound healing?

Inflammation

What is the main purpose of increased blood flow during the inflammatory phase?

To deliver platelets and immune cells

Why are fibroblasts important in wound healing?

They produce new collagen and connective tissue

What is it called when a wound heals with scar formation?

Fibrosis

What is the function of sebum?

To coat the surface of hair and skin and keep them from drying out and becoming brittle.

What is the function of eccrine sweat?

To help regulate temp

What is the function of cerumen?

To protect the ears from entrance of foreign bodies

What is a keloid scar?

When a scar exceeds it initial boundaries