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SEBACEOUS GLAND
An exocrine acinus, wholly secreting gland, associated with hair follicles, which secretes sebum.

SEBUM
An oily matter containing protein substances, a product of the secretion of sebaceous glands mainly made up of cellular waste.

SUDORIFEROUS GLAND
A gland made from a small spheroid, situated deeply in the dermis, which creates a small tube through which sweat flows.
 
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TOXIN
A substance developed, in specific conditions, by certain organisms and the noxious effects of which vary according to the nature of the receptor organism and the dose released.
 
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VACUOLE
A cytoplasmic cavity

VIRUS
A pathogenic agent which cannot be cultivated in an artificial environment, which only multiplies within living cells on which it lives as a parasite. Viruses are essentially made up of a molecule of nucleic acid, of DNA or RNA, and of proteins forming a capsid. They only manifest themselves when they cause a disease.

VITAMIN
A substance which exists in very small quantities, indispensable for metabolism in human beings, which we get from food.