Endocrine and Exocrine Glands

Mammalian skin is characterized by the presence of hair (or fur), sweat glands, and oil (sebaceous) glands, all of which serve various thermoregulatory and protective functions.

The pancreas contains clusters of cells called the Islets of Langerhans, which produce insulin to regulate blood glucose levels.

The poison glands of snakes are modified salivary glands (specifically the parotid glands). This homology is a well-documented evolutionary adaptation in venomous snakes.

At puberty, the voice box or larynx begins to grow. Sometimes, the muscles of the voice box overgrow and the voice becomes hoarse.

Endocrine glands release their secretions directly into the blood stream.

Thyroid gland secretes thyroxine, which controls the process of metamorphosis in a frog.

Pituitary gland is located at the base of the brain. It influences the functioning of the other glands. It produces several hormones that control water balance, growth and it stimulates the testes and the ovaries to produce testosterone, estrogen and progesterone.

The pancreas is a glandular organ that functions as part of the digestive system and the endocrine system, secreting insulin to regulate blood sugar levels.

The adrenal glands, specifically the cortex, produce hormones like aldosterone that regulate water and salt balance in the body.

Wharton duct ejects saliva in a process called gleeking. It drains saliva from submandibular gland to the sublingual caruncle at the base of the tongue.

Hormones are chemical messengers produced by endocrine glands and secreted directly into the bloodstream. They regulate various bodily functions including metabolism, growth, reproduction, and mood. Unlike exocrine glands, endocrine glands are ductless.

The glands containing essential oils from the skin of citrus fruits are lysigenous cavity, they are formed by destruction or dissolution of cells. Oil glands are found in lysigenous cavity.

The liver is the largest internal organ and the largest gland in the human body. It performs numerous vital metabolic functions.

Pituitary

The human palatine tonsils and the nasopharyngeal tonsil are lymphoepithelial tissues, located in strategic areas of the oropharynx and nasopharynx, although most commonly the term tonsils refers to the palatine tonsils.