Types of Glands

Ductless glands that secrete hormones directly into the bloodstream. Made up of clusters of glandular epithelium.

Hormones are protein, amine, or steroid (lipid) substances that maintain homeostasis by changing physiological activities of target organs or all body cells.

Glands with ducts through which their secretions pass (e.g., salivary glands, sweat glands). Not endocrine despite being ductless-adjacent.

Has both endocrine and exocrine functions.

Example: Pancreas — exocrine (digestive enzymes to duodenum) + endocrine (insulin, glucagon to bloodstream).

Consists of two main parts differing in embryological derivation, hormones released, and neural control.

Examples: Pituitary (anterior + posterior lobe) and Adrenal (cortex + medulla).