10 Questions
What type of glands are present on the muzzle and skin between the digits in monotremes?
Compound tubular glands
What is the characteristic of the secretion of sudorific glands in some mammals?
It is sometimes red-colored
Which animal secretes red sweat?
Male giant kangaroo
What is the function of scent glands?
To attract the opposite sex
Where are scent glands located in the deer family?
Near the eyes
What type of glands are present in the margins of the human eye in connection with eyelashes?
Meibomian glands
Which group of mammals has practically no hairs and lacks sebaceous glands?
All of the above
What is the function of sebaceous glands?
To produce sebum
Which type of glands are absent in hippopotamus?
Compound alveolar glands
What is the characteristic of the glands of Moll in the human eye?
They are modified sudorific glands
Study Notes
History of Animals and Evolution
- All animals originated from a single cell and evolved into vertebrates and non-vertebrates
- Evolution occurs to adapt to the environment, influenced by factors such as temperature, light, salinity, predators, toxins, pollution, and gravity
- Cyanobacteria produced oxygen, enabling the sea to support life
- Photosynthesis in blue-green algae helped create oxygen-rich environments
Epidermis and Its Derivatives
- The epidermis is the outermost covering of the chordate body, derived from somatic ectoderm
- Initially, the epidermis is a single layer of columnar epithelium covered by a thin film of cuticle
- In vertebrates, the epidermis differentiates into a multi-layered epithelium
- Epidermis provides mechanical and bacterial protection and prevents drying on land
- In terrestrial vertebrates, the cuticle is replaced by keratin
Kinds of Epidermal Glands
- Unicellular glands: mucous gland cells, granular cells, and beaker cells
- Multicellular glands: tubular, alveolar, and compound glands
- Specific types of glands include:
- Mucous glands: found in fishes and amphibians, providing mucus for protection and lubrication
- Femoral glands: found in male lizards, involved in mating and territorial behavior
- Uropygial glands: found in birds, producing an oil used for preening and waterproofing feathers
- Sudorific or sweat glands: found in mammals, regulating body temperature through evaporation
- Poison glands: found in amphibians, producing toxic secretions for defense
- Preputial glands: found in many mammals, involved in scent marking and mating
- Mammary glands: found in mammals, producing milk for nursing young
- Sebaceous glands: found in mammals, producing an oil (sebum) for skin and hair
- Meibomian glands: modified sebaceous glands, producing an oil for eye lubrication
- Scent glands: found in various animals, producing pheromones for mating and territorial behavior
This quiz covers the structure and function of tubular glands in the skin, including their formation and characteristics, as well as the role of photophores in deep-sea fish.
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