Across
- 3. Eggs with enormous amounts of yolk.
- 6. It is a narrow gully that runs down the middle of the primitive streak.
- 9. Glands with ducts that collect and carry away the product are called.
- 11. Between the integument and deep body musculature is a transitional subcutaneous region made up of very loose connective and adipose tissues called.
- 17. Eggs with moderate amounts of yolk.
- 18. Collagen fibers may be woven into distinct layers called as.
- 20. These are slender, keratinous filaments.
- 21. Vertebrates that lay eggs encapsulated in shells.
- 22. It is the loss of physical vigor and reproductive ability.
- 23. organ formation
- 25. These are plates of tightly compacted, cornified epithelial cells on the surface of fingers and toes.
- 27. It is the space enclosed within the gut.
- 28. Cells that ar specialized to secrete a product are called.
- 30. The release of milk to a suckling is called as.
- 31. It is produced by the epidermis of many vertebrates to moisten the surface of the skin.
- 32. It is one of the largest organs of the body, making up some 15% of the human body weight.
- 33. It produce milk, a watery mixture of fats, carbohydrates, and proteins that nourishes the young.
- 35. The youngest stage of the embryo
- 36. It develops from mesoderm and mesenchyme and produces the reticular lamina.
- 37. The nipple is usually surrounded by a circular pigmented area of skin called the.
- 38. It is derived from the ectoderm and produces the basal lamina.
- 39. It resists penetration by infectious bacteria, probably contributes to laminar flow of water across the surface,makes the fish slippery to predators.
- 40. It results from complex interactions among physical, chemical, and structural properties of the integument.
Down
- 1. A transparent jacket of fibrous protein.
- 2. This tube is a forerunner of the central nervous system and encloses the neurocoel.
- 4. Vertebrates that give birth to embryos without shells.
- 5. In lizards, and especially in snakes, shedding of the cornified layer, results in removal of extensive sections of superficial epidermis is termed as.
- 7. It is a type of unicellular gland that is absent from lamprey skin but is usually found in other bony and cartilaginous fishes.
- 8. It is the process of forming an ectodermal tube, the neural tube.
- 10. These are curved, laterally compressed keratinized projections from the tips of digits.
- 12. It is a specialized type of calcification, unique to vertebrates, involving the deposition of hydroxyapatite (calcium phosphate) in the organic matrix leading to bone formation.
- 13. Eggs with slight amounts of yolk.
- 14. The deep layer of the epidermis which rests upon the basement membrane is called.
- 15. It produce an oily secretion, sebum, that is released into hair follicles in order to condition and help waterproof fur.
- 16. It is a specialized type of mineralization wherein calcium carbonate (invertebrates) or calcium phosphate (vertebrates) is deposited in the organic matrix.
- 19. The gland that is located on the heads of some bird that excretes salt obtained when these birds ingest marine foods and seawater.
- 24. It is the environment immediately around the cell.
- 26. Keratin is a class of proteins produced during keratinization, and the specific epidermal cells that participate are called.
- 29. It is the process by which the embryo forms a distinct endodermal tube.
- 34. It is a general process wherein various inorganic ions are deposited in the organic matrix of tissues to harden them.