Multiple Choice
Which muscle is responsible for controlling the eyebrows by drawing them in and downward?
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5. Integumentary System
Introduction to the Integumentary System
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Which layer of the skin forms a watertight, protective seal for the body?
A
Subcutaneous tissue
B
Hypodermis
C
Dermis
D
Epidermis
Verified step by step guidance1
Understand the structure of the skin: The skin is composed of three main layers—epidermis, dermis, and hypodermis (also known as subcutaneous tissue). Each layer has distinct functions and characteristics.
Focus on the epidermis: The epidermis is the outermost layer of the skin. It is primarily responsible for forming a protective barrier against environmental factors, including pathogens, UV radiation, and water loss.
Learn about keratinocytes: The epidermis contains specialized cells called keratinocytes. These cells produce keratin, a protein that contributes to the skin's strength and waterproof properties.
Understand the role of the stratum corneum: The outermost part of the epidermis, called the stratum corneum, consists of dead keratinized cells. These cells are tightly packed and coated with lipids, creating a watertight seal that prevents water loss and protects the body.
Differentiate the layers: While the dermis and hypodermis provide structural support and insulation, they do not form the watertight seal. The epidermis is the correct answer because it is specifically designed to serve as the body's protective barrier.
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