Rafa - Integumentary System

​FUNCTIONS:

• It protects the body’s internal living tissues and organs.

• It protects the body against microorganisms and invasion by infectious organisms.

• It helps dispose of waste materials.

• It acts as a receptor for touch, pressure, pain, heat, and cold.

• It stores water and fat.

• It helps in the production of vitamin D.​

Science and Health 6​

​Structure of the skin:

• The skin is the main organ of the “integumentary system”.

• SKIN is composed of four types of tissues:

  Epithelial Tissues, Connective Tissues, Muscles Tissues  Nerve Tissues

Science and Health 6​

​Epidermis

​▪outer layer of the skin

▪consists of epithelial cells

▪The outer layer of epidermal cells contains protein called “KERATIN” which water proofs and protects the cells and tissues that lie underneath.

Science and Health 6​

​Dermis

​▪second layer of the skin

▪directly between the epidermis and the subcutaneous layer

▪usually 15 to 40 times thicker than the epidermis.

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Science and Health 6​

​Dermis

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▪consists of connective tissues that prevent the skin from tearing and enables the skin to return to it’s normal state after being stretched.

▪contains structures including nerve cells, muscle fibers, sweat glands, oil glands, and hair follicles

Science and Health 6​

​Subcutaneous layer

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▪layer of connective tissue that stores fats and helps the body retain heat.

Science and Health 6​

​HAIR

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▪threadlike outgrowths from the follicles that are found in the dermis

▪made up of keratin and melanin

▪keeps dusts, insects and other unwanted things out of the body

Science and Health 6​

​NAIL

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▪hard, thin covering on the upper surface of the ends of the fingers or toes

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▪made of keratin

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▪ The fingernail generally serve two purposes:

-serves as a protective plate

- enhances sensation of the fingertip

Science and Health 6​

Multiple Choice

The top layer of the skin is called the _________________.

• dermis
• oil gland
• nerve
• epidermis

Multiple Choice

What are the three main layers of the skin?

• The epidermis, the dermis, and the subcutaneous
• The epidermis, the dermis, and the sebaceous
• The dermis, the sebaceous, and the sudoriferous
• The sudoriferous, the dermis, and the epidermis

Multiple Choice

The coloring in the skin; found in the epidermis.

• Melanin
• Oil
• Perspiration
• Pores

Multiple Choice

The waterproofing protein that fills the cells in the upper layers of the epidermis.

• Keratin
• Melatonin
• Melanin
• Actin

Multiple Choice

What gland is responsible for keeping our hair soft and is a barrier for bacteria and fungi?

• Sudoriferous
• Sebaceous
• Melanin
• Carotene

Multiple Choice

What is the name of tube that our hair grows from?

• Follicle
• Root
• Shaft
• Sebaceous

Multiple Choice

Which layer contains accessory structures such as sweat glands, sebaceous glands, and hair follicles?

• epidermis
• dermis
• hypodermis
• hyperdermis

Multiple Choice

Which layer of the skin does NOT contain blood vessels? 

• epidermis
• hypodermis
• dermis

Multiple Choice

Which are part of the integumentary system?

• Muscles, skeleton, bone marrow

• Hair, skin, bones

• Hair, skin, nails

• Brain, spinal cord, nerves