Oil glands are exocrine glands.
Understanding Exocrine Glands
Exocrine glands secrete substances through ducts onto an epithelial surface. This surface could be the skin or the lining of an internal organ. The defining characteristic of exocrine glands is the presence of ducts.
Oil Glands (Sebaceous Glands) as Exocrine Glands
Oil glands, also known as sebaceous glands, are a type of exocrine gland found in the skin. They secrete an oily substance called sebum. Sebum is secreted through ducts directly onto the skin surface, where it lubricates and waterproofs the skin and hair. This secretion via ducts is the key characteristic that classifies them as exocrine glands.
Key Differences: Endocrine vs. Exocrine
| Feature | Endocrine Glands | Exocrine Glands |
|---|---|---|
| Secretion | Hormones | Various (sweat, oil, enzymes) |
| Ducts | Absent | Present |
| Secretion Location | Directly into the bloodstream | Onto epithelial surface via ducts |
| Examples | Thyroid, pituitary | Sweat glands, salivary glands, oil glands |
In Summary
Oil glands secrete sebum through ducts onto the skin, making them classic examples of exocrine glands. Their method of secretion distinguishes them from endocrine glands, which secrete hormones directly into the bloodstream.
