Granular layer; cells secrete lipids for moisture.

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Multiple Choice

Granular layer; cells secrete lipids for moisture.

The moisture barrier is formed in the granular layer. In the stratum granulosum, keratinocytes produce and release lipids via lamellar bodies into the spaces between cells. These lipids create a hydrophobic barrier that helps lock in moisture and protect the skin from water loss. The hypodermis is the subcutaneous fat layer, not involved in this lipid-secretion process. The stratum spinosum contains living keratinocytes that provide structural support but doesn’t primarily secrete lipids for the barrier. The stratum germinativum (basal layer) is where cell division occurs to replenish the epidermis, not lipid secretion. So, the granular layer is the correct location for lipid secretion that maintains moisture.

The moisture barrier is formed in the granular layer. In the stratum granulosum, keratinocytes produce and release lipids via lamellar bodies into the spaces between cells. These lipids create a hydrophobic barrier that helps lock in moisture and protect the skin from water loss.

The hypodermis is the subcutaneous fat layer, not involved in this lipid-secretion process. The stratum spinosum contains living keratinocytes that provide structural support but doesn’t primarily secrete lipids for the barrier. The stratum germinativum (basal layer) is where cell division occurs to replenish the epidermis, not lipid secretion. So, the granular layer is the correct location for lipid secretion that maintains moisture.

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