_________ glands have vesicles that release their secretion by exocytosis.

A. sebaceous:Sebaceous glands are exocrine glands that release sebum into hair follicles or onto the skin surface through ducts. They are not involved in direct secretion into the bloodstream.

B. exocrine:Exocrine glands secrete their products through ducts onto epithelial surfaces, such as sweat or salivary glands. They differ from endocrine glands, which release secretions directly into the blood.

C. endocrine:Endocrine glands, including the thyroid, pituitary, and adrenal glands, secrete hormones directly into the bloodstream. These hormones regulate numerous physiological processes throughout the body.

D. ceruminous:Ceruminous glands are specialized exocrine glands in the ear canal that secrete cerumen (earwax). They release their product via ducts, not into the blood.

A. areolar CT:Areolar connective tissue provides support and flexibility beneath epithelial layers but does not line tubular structures like the kidney tubules.

B. simple columnar ET:Simple columnar epithelium is specialized for absorption and secretion in areas like the gastrointestinal tract. Its taller cells are not suited for the thin, absorptive lining required in kidney tubules.

C. nonkeratinized stratified squamous ET:This epithelium protects against abrasion in areas such as the esophagus and oral cavity, but its multiple layers and thickness make it inappropriate for kidney tubules where rapid exchange occurs.

D. simple squamous ET:Simple squamous epithelium allows rapid diffusion and is found in structures like the glomerulus, but it is too thin for the majority of the kidney tubules, which require more absorptive and secretory capacity.

E. simple cuboidal ET:Simple cuboidal epithelium forms the lining of most kidney tubules. Its cube-shaped cells provide the surface area necessary for absorption and secretion while maintaining a single-cell layer for efficient transport of substances.